Get Wheels and tires Guide for Mercedes GLC Class SUV First Generation (2015-2021)

458 Wheels and tires

#

Notes on noise or unusual handling charac‐

teristics

Check the tires regularly for signs of

damage and replace any damaged tires

immediately.

Minimum tread depth for:

R

Summer tires: â in (3 mm)

While driving, pay attention to vibrations, noises

and unusual handling characteristics, e.g. pulling

to one side. This may indicate that the wheels or

tires are damaged. If you suspect that a tire is

defective, reduce your speed immediately. Stop

the vehicle as soon as possible to check the

wheels and tires for damage. Hidden tire dam‐

age could also be causing the unusual handling

characteristics. If you find no signs of damage,

have the tires and wheels checked at a qualified

specialist workshop.

R

M+S tires: ã in (4 mm)

#

For safety reasons, replace the tires

&

WARNING Risk of aquaplaning due to

insufficient tire tread

before the legally prescribed limit for

the minimum tread depth is reached.

Insufficient tire tread will result in reduced

tire grip. The tire tread is no longer able to

dissipate water.

This means that in heavy rain or slush the

risk of hydroplaning is increased, in particu‐

lar if vehicle speed is not adapted to suit the

conditions.

If the tire pressure is too high or too low,

tires may exhibit different levels of wear at

different locations on the tire contact sur‐

face.

Carry out the following checks on all wheels reg‐

ularly, at least once a month or as required, e.g.

prior to a long journey or driving off-road:

R

Check the tire pressure (/ page 460).

R

Visually inspect wheels and tires for damage.

R

Check the valve caps.

Notes on regularly inspecting wheels and

tires

The valves must be protected against mois‐

ture and dirt by the valve caps approved

especially for your vehicle by Mercedes-Benz.

&

WARNING Risk of accident from dam‐

aged tires

#

R

Visual check of the tire tread depth and the

tire contact surface across the entire width.

Thus, you should regularly check the

tread depth and the condition of the tire

contact surface across the entire width

of all tires.

Damaged tires can cause tire pressure loss.

As a result, you could lose control of your

vehicle.

The minimum tread depth for summer tires is

â in (3 mm) and for winter tires ã in

(4 mm).

Wheels and tires 459

vehicle by Mercedes-Benz, or snow chains

with the same quality standard.

This could cause damage to the vehicle or

the tires.

R

If snow chains are installed, the maximum

permissible speed is 30 mph (50 km/h).

Vehicles with Active Parking Assist: Do

not use Active Parking Assist when snow

chains are installed.

#

Never mount snow chains on the front

wheels.

#

Only mount snow chains on the rear

wheels in pairs.

R

Vehicles with level control: If snow chains

are installed, only drive at raised vehicle

level.

NOTE Damage to the wheel trim from

*

mounted snow chains

Six marks 1 show where the bar indicators

(arrow) are integrated into the tire tread. They

are visible once a tread depth of approximately

á in (1.6 mm) has been reached.

If snow chains are mounted to steel wheels,

the wheel trims can be damaged.

You can deactivate ESP^®to pull away

(/ page 190). This allows the wheels to

spin, achieving an increased driving force.

%

#

Remove the wheel trims of steel wheels

before mounting snow chains.

Observe the following notes when using snow

chains:

Notes on snow chains

&

WARNING Risk of accident due to incor‐

rect mounting of snow chains

R

Snow chains are only permissible for certain

wheel/tire combinations. You can obtain

information about this from an authorized

Mercedes-Benz Center.

If you have mounted snow chains to the front

wheels, the snow chains may drag against

the vehicle body or chassis components.

R

For safety reasons, only use snow chains that

have been specifically approved for your

460 Wheels and tires

Tire pressure which is too low can cause:

Tire pressure

Notes on tire pressure

R

before embarking on a longer journey

if operating conditions change, e.g. off-

road driving

R

Tire defects as a result of overheating.

R

Impaired handling characteristics.

&

WARNING Risk of accident due to insuf‐

ficient or excessive tire pressure

R

Irregular wear.

#

Adjust the tire pressure as necessary.

R

Increased fuel consumption.

Underinflated or overinflated tires pose the

following risks:

Tire pressure which is too high or too low can:

&

WARNING Risk of accident from exces‐

sive tire pressure

R

Shorten the service life of the tires.

R

The tires may burst, especially as the

load and vehicle speed increase.

R

Cause increased tire damage.

Tires with excessively high pressure can

burst because they are damaged more easily

by highway fill, pot holes etc.

In addition, they also suffer from irregular

wear, which can significantly impair the brak‐

ing properties and the handling characteris‐

tics.

R

Adversely affect driving characteristics and

thus driving safety, e.g. due to hydroplaning.

R

The tires may wear excessively and/or

unevenly, which may greatly impair tire

traction.

&

WARNING Risk of an accident due to

insufficient tire pressure

R

The driving characteristics, as well as

steering and braking, may be greatly

impaired.

Tires with pressure that is too low can over‐

heat and burst as a result.

In addition, they also suffer from excessive

and/or irregular wear, which can significantly

impair the braking properties and the han‐

dling characteristics.

#

Avoid excessively high tire pressures in

all the tires, including the spare wheel.

#

Comply with the recommended tire

pressure and check the tire pressure of

all tires including the spare wheel regu‐

larly:

Tire pressure which is too high can cause:

R

Increased braking distance.

R

at least once a month

#

Avoid excessively low tire pressures in

all the tires, including the spare wheel.

R

Impaired handling characteristics.

R

when the load changes

R

Irregular wear.

Wheels and tires 461

R

Impaired driving comfort.

Susceptibility to damage.

Observe the maximum tire pressure

(/ page 473).

&

WARNING Risk of accident due to

unsuitable accessories on tire valve

Use a suitable pressure gauge to check the tire

pressure. The outer appearance of a tire does

not permit any reliable conclusion about the tire

pressure.

Vehicles with a tire pressure monitoring sys‐

tem: You can also check the tire pressure using

the on-board computer.

If you mount unsuitable accessories onto tire

valves, the tire valves may be overloaded and

malfunction, which can cause a loss of tire

pressure. Aftermarket tire pressure monitor‐

ing systems will cause the tire valve to

remain open, depending on the design. This

can also result in a loss of tire pressure.

&

WARNING Risk of accident caused by

repeated drop in tire pressure

If the tire pressure drops repeatedly, the

wheel, valve or tire may be damaged.

Insufficient tire pressure can cause the tires

to burst.

Only correct tire pressure when the tires are

cold. Conditions for cold tires:

#

Only screw standard valve caps or valve

#

Inspect the tire for signs of foreign

objects.

Check whether the wheel or valve has a

leak.

If you are unable to rectify the damage,

contact a qualified specialist workshop.

caps specifically approved by

Mercedes-Benz for your vehicle onto

the tire valve.

R

The vehicle has been parked with the tires

out of direct sunlight for at least three hours.

#

R

The vehicle has traveled less than 1 mile

(1.6 km).

#

Trailer operation notes

Always inflate the rear axle tires to the recom‐

mended tire pressure on the tire pressure table

for increased load.

A rise in the tire temperature of 18 °F (10 °C)

increases the tire pressure by approx. 10 kPa

(0.1 bar/1.5 psi). Take this into account when

checking the tire pressure of warm tires.

The tire pressure recommended for increased

load/speed in the tire pressure table can affect

the ride comfort.

You can find information on tire pressure for the

vehicle's factory-installed tires on the following

labels:

Tire pressure table

R

Tire and Loading Information placard on the

B‑pillar of your vehicle (/ page 467).

The tire pressure table is on the inside of the

fuel filler flap.

R

Tire pressure table on the inside of the fuel

filler flap (/ page 461).

462 Wheels and tires

R

% The data shown in the images is example

Maximum tire pressure (/ page 473)

data.

Checking tire pressures manually

#

Read the tire pressure for the current operat‐

ing conditions from the Tire and Loading

Information placard or the tire pressure

table. Observe the notes on tire pressure.

#

Remove the valve cap of the tire to be

checked.

#

Press the tire pressure gauge securely onto

the valve.

#

Read the tire pressure.

If the tire pressure is lower than the recom‐

mended value, increase the tire pressure to

the recommended value.

If the tire pressure is higher than the recom‐

mended value, release air. To do so, press

down the metal pin in the valve, e.g. using

the tip of a pen for example. Then check the

tire pressure again using the tire pressure

gauge.

The tire pressure table shows the recommended

tire pressure for all tires approved for this vehi‐

cle. The recommended tire pressures apply for

cold tires under various operating conditions, i.e.

loading and/or speed of the vehicle.

If one or more tire sizes precede a tire pressure,

the tire pressure information following is only

valid for those tire sizes.

The load conditions "partially laden" and "fully

laden" are defined in the table for different num‐

bers of passengers and amounts of luggage. The

actual number of seats may differ from this.

#

Some tire pressure tables only show the rim

diameter instead of the complete tire size, e.g.

R18. The rim diameter is part of the tire size and

can be found on the tire side wall (/ page 474).

Be sure to also observe the following further

related subjects:

#

R

Notes on tire pressure (/ page 460)

#

Screw the valve cap onto the valve.

R

Tire and Loading Information placard

(/ page 467)

Wheels and tires 463

Further related subjects:

As an added safety feature, your vehicle has

been equipped with a tire pressure monitor‐

ing system (TPMS) that illuminates a low tire

pressure telltale when one or more of your

tires is significantly under-inflated. Accord‐

ingly, when the low tire pressure telltale illu‐

minates, you should stop and check your

tires as soon as possible, and inflate them to

the proper pressure. Driving on a signifi‐

cantly under-inflated tire causes the tire to

overheat and can lead to tire failure. Under-

inflation also reduces fuel efficiency and tire

tread life, and may affect the vehicle’s han‐

dling and stopping ability.

Please note that the TPMS is not a substitute

for proper tire maintenance, and it is the

driver’s responsibility to maintain correct tire

pressure, even if under-inflation has not

reached the level to trigger illumination of

the TPMS low tire pressure telltale.

the low tire pressure telltale. When the sys‐

tem detects a malfunction, the telltale will

flash for approximately one minute and then

remain continuously illuminated. This

sequence will continue upon subsequent

vehicle start-ups as long as the malfunction

exists.

When the malfunction indicator is illumina‐

ted, the system may not be able to detect or

signal low tire pressure as intended. TPMS

malfunctions may occur for a variety of rea‐

sons, including the installation of replace‐

ment or alternate tires or wheels on the vehi‐

cle that prevent the TPMS from functioning

properly.

R

Notes on tire pressure (/ page 460)

R

Tire pressure table (/ page 461)

R

Tire and Loading Information placard

(/ page 467)

Tire pressure monitoring system

Function of the tire pressure monitoring sys‐

tem

&

DANGER Risk of accident due to incor‐

rect tire pressure

Each tire, including the spare (if provided),

should be checked monthly when cold and

inflated to the inflation pressure recommen‐

ded by the vehicle manufacturer on the vehi‐

cle placard or tire inflation pressure label. (If

your vehicle has tires of a different size than

the size indicated on the vehicle placard or

the tire inflation pressure label, you should

determine the proper tire inflation pressure

for those tires).

Always check the TPMS malfunction telltale

after replacing one or more tires or wheels

on your vehicle to ensure that the replace‐

ment or alternate tires and wheels allow the

TPMS to continue to function properly.

Your vehicle has also been equipped with a

TPMS malfunction indicator to indicate when

the system is not operating properly. The

TPMS malfunction indicator is combined with

The system checks the tire pressure and the tire

temperature of the tires installed on the vehicle

by means of a tire pressure sensor.

464 Wheels and tires

New tire pressure sensor, e.g. in winter tires, are ues by restarting the tire pressure monitoring

On-board computer:

automatically taught-in during the first journey

they are used.

The tire pressure and the tire temperature

appear in the multifunction display

(/ page 464).

If there is a substantial pressure loss or if the

tire temperature is excessive, you will be warned

in the following ways:

system manually (/ page 465).

4

5

Service

Tires

System limits

The system may be impaired or may not function

in the following situations:

One of the following displays appears:

R

Current tire pressure and tire temperature of

the individual wheels:

R

the tire pressure has been set incorrectly

R

there is a sudden pressure loss caused, for

example, by a foreign object penetrating the

tire

R

via display messages (/ page 546)

R

there is a malfunction caused by another

radio signal source

R

via the h warning lamp in the instrument

cluster (/ page 566)

Make sure to observe the following further rela‐

ted subject:

The tire pressure monitoring system is only an

aid. It is the driver's responsibility to set the tire

pressure to the recommended cold tire pressure

suitable for the operating situation. Set the tire

pressure for cold tires using a tire pressure

gauge. Note that the correct tire pressure for the

current operating situation must first be taught-

in to the tire pressure monitoring system.

R

notes on tire pressure (/ page 460)

R

Tire pressure will be displayed after driving a

Checking the tire pressure with the tire pres‐

sure monitoring system

Requirements:

few minutes

R

Tire Pressure Monitor Active: the teach-in

process of the system is not yet complete.

The tire pressures are already being moni‐

tored.

R

The ignition is switched on.

In most cases, the tire pressure monitoring sys‐

tem will automatically update the new reference

values after you have changed the tire pressure.

You can, however, also update the reference val‐

#

Compare the tire pressure with the recom‐

mended tire pressure for the current operat‐

Wheels and tires 465

Radio-equipment approval of the tire pres‐

sure monitoring system

ing condition (/ page 461). Observe the

notes on tire temperature (/ page 460).

On-board computer:

4

5

Service

Tires

% The values displayed in the multifunction dis‐

play may deviate from those of the tire pres‐

sure gauge as they refer to sea level. At high

altitudes, the tire pressure value indicated by

a pressure gauge are higher than those

shown by the on-board computer. In this

case, do not reduce the tire pressure.

#

Radio equipment approval numbers

Swipe downwards on Touch Control on the

left-hand side of the steering wheel.

The Use Current Pressures as New Refer-

ence Values? message is shown in the multi‐

function display.

Country

Radio type approval number

Canada

IC: 2546A-GG4T

IC: 2546A-DG6W2D4

IC: 2546A-MC34MA4

#

To begin restart, press Touch Control on the

left-hand side of the steering wheel.

Make sure to observe the following further rela‐

ted subject:

The Tire Press. Monitor Restarted message is

USA

FCC ID: MRXGG4T

shown in the multifunction display.

FCC ID: MRXDG6W2D4

FCC ID: MRXMC34MA4

R

Notes on tire pressure (/ page 460)

Current warning messages are deleted and

the yellow h warning lamp goes out.

After you have been driving for a few

minutes, the system checks whether the cur‐

rent tire pressures are within the specified

range. The current tire pressures are then

accepted as reference values and monitored.

Restarting the tire pressure monitoring sys‐

tem

Requirements:

Further information on the declaration of con‐

formity for wireless vehicle components

(/ page 25).

R

The recommended tire pressure is correctly

set for the respective operating status on

each of the four wheels (/ page 460).

Tire pressure loss warning system

Make sure to observe the following further rela‐

ted subject:

Restart the tire pressure monitoring system in

the following situations:

Function of the tire pressure loss warning

system

The tire pressure loss warning system warns the

driver by means of display messages when there

is a severe tire pressure loss.

R

Notes on tire pressure (/ page 460)

R

The tire pressure has changed.

R

The wheels or tires have been changed or

newly installed.

466 Wheels and tires

After a change in tire pressure, a wheel rotation

or a tire change, or if you have re-installed

wheels or tires, the tire pressure loss warning

system has to be restarted (/ page 466).

The tire pressure loss warning system does not

replace the need to regularly check the tire pres‐

sure.

Be sure to also observe the following further

related subjects:

The Run Flat Indicator ActiveRestart: Press

Touch Control message is shown in the multi‐

function display

Restart the tire pressure loss warning system in

the following situations:

R

Notes on tire pressure (/ page 460)

R

Display messages about the tires

(/ page 546)

R

The tire pressure has changed.

Restarting the tire pressure loss warning

system

Requirements:

R

The wheels or tires have been changed or

newly installed.

System limitations

The system may be impaired or may not function

particularly in the following situations:

R

#

The recommended tire pressure is correctly

To begin restart, press Touch Control on the

set for the respective operating status on

left-hand side of the steering wheel.

The Tire Pressure Now OK? message is

shown in the multifunction display

R

Incorrectly set tire pressure

each of the four wheels (/ page 460).

R

Sudden pressure loss caused, for example,

by a foreign object penetrating the tire

Restart the tire pressure loss warning system in

the following situations:

#

Select Yes.

R

Steady pressure loss in several tires

#

To confirm restart, press Touch Control on

the left-hand side of the steering wheel.

The Run Flat Indicator Restarted message is

shown in the multifunction display.

R

The tire pressure has changed.

The wheels or tires have been changed or

newly installed.

R

The system has a restricted or delayed function

particularly in the following situations:

R

Poor ground conditions, e.g. snow or gravel

On-board computer:

4

Be sure to also observe the following further

related subjects:

R

Driving with snow chains

5

Service

Tires

R

When adopting a very sporty driving style

R

#

Notes on tire pressure (/ page 460)

Swipe downwards on Touch Control on the

left-hand side of the steering wheel.

with high cornering speeds or sudden accel‐

eration

R

Driving with a high load

Wheels and tires 467

Loading the vehicle

Notes on Tire and Loading Information plac‐

ard

&

WARNING Risk of accident from overloa‐

ded tires

Overloaded tires may overheat and burst as a

consequence. Overloaded tires can also

impair the steering and handling characteris‐

tics and lead to brake failure.

1

Tire and Loading Information placard

#

Observe the load-bearing capacity of

the tires.

#

The load-bearing capacity must be at

least half the gross axle weight rating of

the vehicle.

Never overload the tires by exceeding

the maximum load.

% The data shown in the illustration is example

#

data.

The Tire and Loading Information placard shows:

R

Maximum number of seats 2 according to

the maximum number of people permitted to

travel in the vehicle.

The Tire and Loading Information placard is on

the B-pillar on the driver's side of the vehicle.

R

Maximum permissible load 3 comprises the

gross weight of all vehicle occupants, load

and luggage.

468 Wheels and tires

#

R

Recommended tire pressures 1 for cold

(1): Locate the statement "The combined

weight of occupants and cargo should never

exceed XXX kg or XXX lbs." on your vehicle's

placard.

(2): Determine the combined weight of the

driver and passengers that will be riding in

your vehicle.

(3): Subtract the combined weight of the

driver and passengers from XXX kg or

XXX lbs.

your vehicle. Consult this manual to deter‐

mine how this reduces the available cargo

and luggage load capacity of your vehicle.

tires. The recommended tire pressures are

valid for the maximum permissible load and

up to the maximum permissible vehicle

speed.

% Not all vehicles are permitted to tow a

trailer. Towing a trailer is only permitted if a

trailer-hitch is installed. Please consult an

authorized Mercedes-Benz dealer if you have

any questions about towing a trailer with

your vehicle.

Even if you have calculated the total load care‐

fully, you should still make sure that the maxi‐

mum permissible gross weight and the maxi‐

mum gross axle weight rating of your vehicle are

not exceeded. Details can be found on the vehi‐

cle identification plate.

#

Please also note:

R

Information on permissible weights and loads

on the vehicle identification plate

(/ page 494).

R

Information on tire pressure in the tire pres‐

sure table (/ page 461).

(4): The resulting figure equals the available

amount of cargo and luggage load capacity.

For example, if the "XXX" amount equals

1400 lbs. and there will be five 150 lb pas‐

sengers in your vehicle, the amount of availa‐

ble cargo and luggage load capacity is

Further related subjects:

R

Determining the maximum permissible load

(/ page 468)

Notes on tire pressure (/ page 460).

#

Have your loaded vehicle – including driver,

occupants and load – weighed on a vehicle

weighbridge.

The measured values may not exceed the

maximum permissible values stated on the

vehicle identification plate.

R

650 lbs. (1400 - 750 (5 x 150) = 650 lbs.)

#

(5): Determine the combined weight of lug‐

gage and cargo being loaded on the vehicle.

The weight may not safely exceed the availa‐

ble cargo and luggage load capacity calcula‐

ted in Step 4.

(6): If your vehicle will be towing a trailer,

load from your trailer will be transferred to

Steps for Determining Correct Load Limit

The following steps have been developed as

required of all manufacturers under Title 49,

Code of U.S. Federal Regulations, Part 575, pur‐

suant to the "National Traffic and Motor Vehicle

Safety Act of 1966".

Further related subjects:

R

Calculation example for determining the max‐

imum load (/ page 469)

Wheels and tires 469

R

Calculation example for determining the

maximum load

Tire and Loading Information placard

is for illustration purposes only. Make sure

you are using the actual load limit for your vehi‐

cle stated on your vehicle's Tire and Loading

Information placard (/ page 467).

The higher the weight of all the occupants, the

smaller the maximum load for luggage.

(/ page 467)

R

Tire pressure table (/ page 461)

Vehicle identification plate

The following table shows examples of how to

calculate total and load capacities with varying

seating configurations and different numbers

and sizes of occupants. The following examples

use a maximum load of 1500 lbs (680 kg). This

Step 1

Example 1

Example 2

Combined maximum weight of occupants and

load (data from the Tire and Loading Information

placard)

1500 lbs (680 kg)

Step 2

Example 1

Example 2

Number of people in the vehicle (driver and

occupants)

5

1

Distribution of the occupants

Front: 2

Rear: 3

Front: 1

470 Wheels and tires

Example 1

Example 2

Weight of occupants

Occupant 1: 150 lbs (68 kg)

Occupant 2: 180 lbs (82 kg)

Occupant 3: 160 lbs (73 kg)

Occupant 4: 140 lbs (63 kg)

Occupant 5: 120 lbs (54 kg)

Occupant 1: 200 lbs (91 kg)

Total weight of all occupants

750 lbs (340 kg)

200 lbs (91 kg)

Step 3

Example 1

Example 2

Permissible load (maximum gross vehicle weight

rating from the Tire and Loading Information

placard minus the gross weight of all occupants)

1500 lbs (680 kg) Ò 750 lbs (340 kg) = 750 lbs

(340 kg)

1500 lbs (680 kg) Ò 200 lbs (91 kg) = 1300 lbs

(589 kg)

Wheels and tires 471

5

6

7

Manufacturer

Characteristics of the tire (/ page 474)

Tire size designation, load-bearing capacity,

speed rating and load index (/ page 474)

Tire labeling

Overview of tire labeling

8

Tire name

% The data shown in the image is example

data.

Tire Quality Grading

1

2

3

Tread wear grade

Traction grade

Temperature grade

In accordance with the US Department of Trans‐

portation's "Uniform Tire Quality Grading Stand‐

ards", tire manufacturers are required to grade

their tires on the basis of the following three per‐

formance factors:

% The data shown in the illustration is example

data.

% The classification is not legally stipulated for

Canada, but it is generally stated.

Tread wear grade

1

2

Uniform Tire Quality Grading Standard

The tread wear grade is a comparative rating

based on the wear rate of the tire when tested

under controlled conditions on a specified test

track of the US Department of Transportation.

For example, a tire graded 150 would wear one

(/ page 471)

DOT, Tire Identification Number

(/ page 472)

Maximum tire load (/ page 473)

Maximum tire pressure (/ page 473)

3

4

472 Wheels and tires

and one-half times as well on the government

test track as a tire graded 100.

sure of all tires including the spare

wheel.

NOTE Damage to the drivetrain from

wheelspin

*

The relative performance of tires depends upon

the actual conditions of their use, however, and

may depart significantly from the norm due to

variations in driving habits, service practices and

differences in road characteristics and climate

conditions.

#

Adjust the tire pressure as necessary.

#

Avoid wheelspin.

The temperature grades are A (the highest), B

and C. They represent the tire's resistance to the

generation of heat and its ability to dissipate

heat when tested under controlled conditions on

a specified indoor laboratory test wheel. Sus‐

tained high temperature can cause the material

of the tire to degenerate and reduce tire life, and

excessive temperature can lead to sudden tire

failure. Grade C corresponds to a level of per‐

formance which all passenger car tires must

meet under the Federal Motor Safety Standard

No. 109. Grades B and A represent higher levels

of performance on the laboratory test wheel

than the minimum required by law.

The traction classes, from highest to lowest, are

AA, A, B and C. Those grades represent the tire's

ability to stop on wet pavement as measured

under controlled conditions on specified govern‐

ment test surfaces of asphalt and concrete. A

tire marked C may have poor traction perform‐

ance.

Traction grade

&

DANGER Risk of accident due to inade‐

quate traction

Temperature grade

The traction grade assigned to this tire is

based on straight-ahead braking traction

tests, and does not include either accelera‐

tion, cornering, hydroplaning or peak traction

characteristics.

&

WARNING Risk of accident from tire

overheating and tire failure

The temperature grade for this tire is estab‐

lished for a tire that is properly inflated and

not overloaded. Excessive speed, underinfla‐

tion, or excessive loading, either separately

or in combination, can cause excessive heat

build-up and possible tire failure.

#

Always adapt your driving style and

drive at a speed to suit the prevailing

traffic and weather conditions.

DOT, Tire Identification Number (TIN)

US tire regulations stipulate that every tire man‐

ufacturer or retreader must imprint a TIN in or

on the side wall of each tire produced.

#

Observe the recommended tire pres‐

sures and regularly check the tire pres‐

Wheels and tires 473

R

Tire size: identifier 3 describes the tire

% The data shown in the image is example

data.

size.

Maximum tire load 1 is the maximum permissi‐

ble weight for which the tire is approved.

Do not overload the tires by exceeding the speci‐

fied load limit. The maximum permissible load

can be found on the vehicle's Tire and Loading

Information placard on the B-pillar on the driv‐

er's side (/ page 467).

Tire type code: tire type code 4 can be

used by the manufacturer as a code to

describe specific characteristics of the tire.

Manufacturing date: manufacturing date

5 provides information about the age of a

tire. The 1st and 2nd positions represent the

calendar week and the 3rd and 4th positions

state the year of manufacture (e.g. "3208"

represents the 32nd week of 2008).

R

% The data shown in the image is example

Specifications for maximum tire pressure

data.

The TIN is a unique identification number to

identify tires and comprises the following:

Information on the maximum tire load

R

DOT (Department of Transportation): tire

symbol marks 1 indicating that the tire

complies with the requirements of the US

Department of Transportation.

R

Manufacturer identification code: manu‐

facturer identification code 2 contains

details of the tire manufacturer. New tires

have a code with two symbols. Retreaded

tires have a code with four symbols. Further

information on retreaded tires (/ page 479).

% The data shown in the image is example

data.

474 Wheels and tires

Tire size designation, load-bearing capacity,

speed rating and load index

Never exceed maximum tire pressure 1 speci‐

fied for the tire.

&

WARNING Risk of injury through exceed‐

ing the specified tire load rating or the

permissible speed rating

Information on tire characteristics

Exceeding the specified tire load rating or

the permissible speed rating may lead to tire

damage and to the tires bursting.

#

Therefore, only use tire types and sizes

approved for your vehicle model.

1

2

3

4

5

6

7

8

Preceding letter

Nominal tire width in millimeters

Aspect ratio in %

Tire code

Rim diameter

Load-bearing index

Speed rating

#

Observe the tire load rating and speed

rating required for your vehicle.

% The data shown in the image is example

data.

This information describes the type of tire cord

and the number of layers in side wall 1 and

under tire tread 2.

Load index

% The data shown in the image is example

data.

Information about reading tire data can be

obtained from any qualified specialist workshop.

Wheels and tires 475

Preceding letter 1:

Rim diameter 5:

% An electronic speed limiter prevents your

vehicle from exceeding a speed of 130 mph

(210 km/h).

Make sure that your tires have the required

speed rating. You can obtain information on the

required speed rating from an authorized

Mercedes-Benz Center.

R

Without: passenger vehicle tires according to The diameter of the bead seat (not the diameter

European manufacturing standards.

"P": passenger vehicle tires according to US

manufacturing standards.

"LT": light truck tires according to US manu‐

facturing standards.

"T": compact emergency spare wheels with

high tire pressure that are only designed for

temporary use in an emergency.

of the rim flange). The rim diameter is specified

in inches (in).

Load-bearing index 6:

Numerical code that specifies the maximum

load-bearing capacity of a tire (e.g. "91" corre‐

sponds to 1356 lbs (615 kg)).

Summer tires

The load-bearing capacity of the tire must be at

least half the permissible axle load of your vehi‐

cle. Do not overload the tires by exceeding the

specified load limit.

Index

Speed rating

Q

R

S

T

up to 100 mph (160 km/h)

up to 106 mph (170 km/h)

up to 112 mph (180 km/h)

up to 118 mph (190 km/h)

up to 130 mph (210 km/h)

up to 149 mph (240 km/h)

up to 168 mph (270 km/h)

up to 186 mph (300 km/h)

Aspect ratio 3:

Ratio between tire height and tire width in per‐

cent (tire height divided by tire width).

See also:

R

Maximum permissible load on the Tire and

Loading Information placard (/ page 467)

Tire code 4 (tire type):

R

"R" radial tire

R

Maximum tire load (/ page 473)

R

"D": bias ply tire

H

V

W

Y

R

Load index

R

"B": bias belted tires

Speed rating 7:

Specifies the approved maximum speed of the

tire.

R

"ZR": radial tire with a maximum speed above

149 mph (240 km/h) (optional)

476 Wheels and tires

All-weather tires and winter tires

R

"C", "D", "E": a load range that depends on

the maximum load that the tire can carry at a

certain pressure

Index

ZR...Y¹

ZR...(..Y)¹

ZR¹

Speed rating

Index

Speed rating

up to 186 mph (300 km/h)

over 186 mph (300 km/h)

over 149 mph (240 km/h)

Q M+S²

T M+S²

H M+S²

V M+S²

up to 100 mph (160 km/h)

up to 118 mph (190 km/h)

up to 130 mph (210 km/h)

up to 149 mph (240 km/h)

Definition of terms for tires and loading

Tire structure and characteristics: describes

the number of layers or the number of rubber-

coated belts in the tire contact surface and the

tire wall. These are made of steel, nylon, poly‐

ester and other materials.

Bar: metric unit for tire pressure.

14.5038 pounds per square inch (psi) and

100 kilopascal (kPa) is the equivalent of one bar.

DOT (Department of Transportation): DOT-

marked tires fulfill the requirements of the

US Department of Transportation.

Average weight of the vehicle occupants: the

number of vehicle occupants for which the vehi‐

cle is designed, multiplied by 150 lb (68 kg).

R

Specifying the speed rating as the "ZR" index

in tire code 4 is optional for tires up to

186 mph (300 km/h).

If your tire code 4 includes "ZR" and there

is no speed rating 7, find out what the max‐

imum speed is from the tire manufacturer.

If load-bearing index 6 and speed rating 7

are in brackets, the maximum speed rating of

your tire is above 186 mph (300 km/h). To

find out the maximum speed, ask the tire

manufacturer.

Winter tires bear the i snowflake symbol

and fulfill the requirements of the Rubber Manu‐

facturers Association (RMA) and the Rubber

Association of Canada (RAC) regarding the tire

traction on snow.

Load index 8:

R

No specification given: standard load (SL)

tire

R

"XL" or "Extra Load": extra load tire or rein‐

forced tire

R

"Light Load": light load tire

1

2

"ZR" stated in the tire code.

Or "M+S i" for winter tires

Wheels and tires 477

Uniform Tire Quality Grading Standards: a

uniform standard to grade the quality of tires

with regard to tread quality, tire traction and

temperature characteristics. The quality grading

assessment is made by the manufacturer follow‐

ing specifications from the U.S. government. The

quality grade of a tire is imprinted on the side

wall of the tire.

Recommended tire pressure: the recommen‐

ded tire pressure is the tire pressure specified

for the tires mounted to the vehicle at the fac‐

tory.

The tire and information table contains the rec‐

ommended tire pressures for cold tires, the max‐

imum permissible load and the maximum per‐

missible vehicle speed.

The tire pressure table contains the recommen‐

ded tire pressures for cold tires under various

operating conditions, i.e. loading and/or speed

of the vehicle.

regardless of whether it is actually installed on

the vehicle or not.

Rim: the part of the wheel on which the tire is

installed.

of the fully laden vehicle (weight of the vehicle

including all accessories, occupants, fuel, lug‐

gage and the trailer drawbar noseweight if appli‐

cable). The gross vehicle weight rating is speci‐

fied on the vehicle identification plate on the

B‑pillar on the driver's side.

Maximum weight of the laden vehicle: the

maximum weight is the sum of the curb weight

of the vehicle, the weight of the accessories, the

maximum load and the weight of optional equip‐

ment installed at the factory.

Kilopascal (kPa): metric unit for tire pressure.

6.9 kPa corresponds to 1 psi. Another unit for

tire pressure is bar. 100 kilopascal (kPa) equals

1 bar.

Load index: in addition to the load-bearing

index, the load index may also be imprinted on

the side wall of the tire. This specifies the load-

bearing capacity of the tire more precisely.

GAWR (Gross Axle Weight Rating): the GAWR

is the maximum permissible axle load. The

actual load on an axle must never exceed the

gross axle weight rating. The gross axle weight

rating can be found on the vehicle identification

plate on the B‑pillar on the driver's side.

Speed rating: the speed rating is part of the tire

identification. It specifies the speed range for

which a tire is approved.

GVW (Gross Vehicle Weight): the gross vehicle

weight comprises the weight of the vehicle

including fuel, tools, the spare wheel, accesso‐

ries installed, occupants, luggage and the trailer

drawbar noseweight, if applicable. The gross

vehicle weight must not exceed the gross vehicle

weight rating GVWR as specified on the vehicle

identification plate on the B‑pillar on the driver's

side.

Curb weight: the weight of a vehicle with stand‐

ard equipment including the maximum capacity

of fuel, oil and coolant. It also includes the air

conditioning system and optional equipment if

Increased vehicle weight due to optional

equipment: the combined weight of all standard

and optional equipment available for the vehicle,

GVWR (Gross Vehicle Weight Rating): the

GVWR is the maximum permitted gross weight

478 Wheels and tires

these are installed on the vehicle, but does not

include passengers or luggage.

without direct sunlight on the tires or the vehicle er's identity code, tire size, tire type code and

has been driven for less than 1 mile (1.6 km).

the manufacturing date.

Maximum tire load: the maximum tire load is

Tire contact surface: the part of the tire that

Load-bearing index: the load-bearing index is a

code that contains the maximum load-bearing

capacity of a tire.

the maximum permissible weight in kilograms or comes into contact with the road.

lbs for which a tire is approved.

Maximum permissible tire pressure: maxi‐

mum permissible tire pressure for one tire.

Maximum load on one tire: maximum load on

one tire. This is calculated by dividing the maxi‐

mum axle load of one axle by two.

PSI (pounds per square inch): standard unit of

measurement for tire pressure.

Tire bead: the purpose of the tire bead is to

ensure that the tire sits securely on the wheel

rim. There are several wire cores in the tire bead tion between the tires and the road surface.

to prevent the tire from changing length on the

wheel rim.

Side wall: the part of the tire between the tread

and the tire bead.

Weight of optional equipment: the combined

weight of the optional equipment weighing more

than the replaced standard parts and more than

5 lbs (2.3 kg). This optional equipment, such as

high-performance brakes, level control system, a

roof luggage rack or high-performance batteries,

is not included in the curb weight and the weight

of the accessories.

TIN (Tire Identification Number): a unique

identification number which can be used by a

tire manufacturer to identify tires, for example,

in a product recall, and thus identify the pur‐

chasers. The TIN is made up of the manufactur‐

Traction: traction is the grip resulting from fric‐

Wear indicator: narrow bars (tread wear bars)

that are distributed over the tire contact surface.

If the tire tread is level with the bars, the wear

limit of 1/16 in (1.6 mm) has been reached.

Distribution of vehicle occupants: distribution

of vehicle occupants over designated seat posi‐

tions in a vehicle.

Maximum permissible payload weight: nomi‐

nal load and luggage load plus 150 lb (68 kg)

multiplied by the number of seats in the vehicle.

Aspect ratio: ratio between tire height and tire

width in percent.

Tire pressure: pressure inside the tire applying

an outward force to every square inch of the tire.

The tire pressure is specified in pounds per

square inch (psi), in kilopascals (kPa) or in bar.

The tire pressure should only be corrected when

the tires are cold.

Cold tire pressure: the tires are cold when the

vehicle has been parked for at least 3 hours

Wheels and tires 479

Changing a wheel

Notes on selecting, installing and replacing

tires

R

Model

NOTE Vehicle and tire damage through

tire types and sizes that have not been

approved

*

When replacing tires, make sure to install the

correct:

For safety reasons, only use tires, wheels

and accessories which have been specially

approved by Mercedes-Benz for your vehicle.

These tires are specially adapted to the con‐

trol systems, such as ABS, ESP^®and

4MATIC, and marked as follows:

Mercedes-AMG vehicles: observe the notes in

the Supplement. Otherwise, you may fail to rec‐

ognize dangers.

You can ask for information regarding permitted

wheel/tire combinations at an authorized

Mercedes-Benz Center.

R

Designation

Manufacturer

Model

R

&

WARNING Risk of injury through exceed‐

ing the specified tire load rating or the

permissible speed rating

R

MO = Mercedes-Benz Original

&

WARNING Risk of accident due to incor‐

rect dimensions of wheels and tires

R

MOE = Mercedes-Benz Original Extended

(run-flat tire only for certain wheels)

Exceeding the specified tire load rating or

the permissible speed rating may lead to tire

damage and to the tires bursting.

If wheels and tires of the wrong size are

installed, the wheel brakes or wheel suspen‐

sion components may be damaged.

R

MO1 = Mercedes-Benz Original (only cer‐

tain AMG tires)

#

Therefore, only use tire types and sizes

approved for your vehicle model.

Observe the tire load rating and speed

rating required for your vehicle.

Certain characteristics, such as handling,

vehicle noise emissions, fuel consumption,

etc. may otherwise be adversely affected.

Furthermore, other tire sizes could result in

the tires rubbing against the body and axle

components when loaded. This could result

in damage to the tire or the vehicle.

#

Always replace wheels and tires with

those that fulfill the specifications of

the original part.

#

When replacing wheels, make sure to fit the

correct:

R

Designation

480 Wheels and tires

Accessory parts that are not approved for your

vehicle by Mercedes-Benz or are not being used

correctly can impair the operating safety.

#

Only use tires, wheels and accessories that

have been checked and recommended by

Mercedes-Benz.

Avoid obstacles or drive particularly

carefully.

Before purchasing and using non-approved

accessories, visit a qualified specialist workshop

and inquire about:

NOTE Damage to electronic component

*

NOTE Risk to driving safety from retrea‐

*

parts from the use of tire-mounting tools

ded tires

Vehicles with a tire pressure monitoring

system: Electronic component parts are

located in the wheel. Tire-mounting tools

should not be used in the area of the valve.

This could otherwise damage the electronic

component parts.

R

Suitability

Retreaded tires are neither tested nor recom‐

mended by Mercedes-Benz, since previous

damage cannot always be detected on

retreaded tires.

For this reason driving safety cannot be guar‐

anteed.

R

Legal stipulations

R

Factory recommendations

&

WARNING Risk of accident with high

performance tires

#

Have the tires changed at a qualified

specialist workshop only.

The special tire tread in combination with the

optimized tire compound means that the risk

of skidding or hydroplaning on wet roads is

increased.

In addition, the tire grip is greatly reduced at

a low outside temperature and tire running

temperature.

#

Do not use used tires if you have no

information about their previous usage.

NOTE Damage to summer tires at low

ambient temperatures

*

NOTE Possible damage to wheels or tires

when driving over obstacles

*

At low ambient temperatures, tears could

form when driving with summer tires, caus‐

ing permanent damage to the tires.

Large wheels have a lower tire section width.

The lower the tire section width, the greater

is the risk of damage to wheels or tires when

driving over obstacles.

Switch on the ESP^®and adapt your

driving style accordingly.

#

At temperatures below 45 °F (7 °C),

use M+S tires .

#

Use M+S tire at outside temperatures

of less than 10 °C (50 °F).

Wheels and tires 481

R

Observe the following when selecting, installing

and replacing tires:

For M+S tires, only use tires with the same

tread.

Observe the maximum permissible speed for

the M+S tires installed.

If this is below the vehicle's maximum speed,

this must be indicated by an appropriate

label in the driver's field of vision.

Tire and Loading Information placard

(/ page 467)

R

Only use tires and wheels of the same type

Tire size designation, load-bearing capacity,

speed rating and load index (/ page 474)

Tire pressure table (/ page 461)

Notes on the emergency spare wheel

(/ page 488)

(summer tires, winter tires, MOExtended

tires) and the same make.

R

Only install wheels of the same size on one

axle (left and right).

R

It is only permissible to install a different

wheel size in the event of a flat tire in order

to drive to the specialist workshop.

Only install tires of the correct size onto the

wheels.

Break in new tires at moderate speeds for

the first 60 miles (100 km).

Replace the tires after six years at the latest,

regardless of wear.

Notes on rotating wheels

R

&

WARNING Risk of injury through differ‐

ent wheel sizes

^RWhen replacing with tires that do not fea‐

ture run-flat characteristics: vehicles with

MOExtended tires are not equipped with a

TIREFIT kit at the factory. Equip the vehicle

with a TIREFIT kit after replacing with tires

that do not feature run-flat characteristics,

e.g. winter tires.

^RVehicles with a tire pressure monitoring

system: All installed wheels must be equip‐

ped with functioning sensors for the tire

pressure monitoring system.

Interchanging the front and rear wheels if the

wheels or tires have different dimensions

may severely impair the driving characteris‐

tics.

The wheel brakes or wheel suspension com‐

ponents may also be damaged.

R

At temperatures below 45 °F (7 °C), use win‐

ter tires or all-season tire marked M+S for all

wheels.

Winter tires bearing the i snowflake sym‐

bol in addition to the M+S marking provide

the best possible grip in wintry road condi‐

tions.

For more information on wheels and tires, con‐

tact a qualified specialist workshop.

Be sure to also observe the following further

related subjects:

#

Rotate front and rear wheels only if the

wheels and tires are of the same dimen‐

sions.

R

Notes on tire pressure (/ page 460)

482 Wheels and tires

Notes on storing wheels

R

The wear patterns on the front and rear wheels

differ:

Lug wrench

Alignment bolt

When storing wheels, observe the following

notes:

R

Front wheels wear more on the shoulder of

the tire

The tire-change tool kit is located under the

cargo compartment floor.

R

After removing wheels, store them in a cool,

dry and preferably dark place.

R

Rear wheels wear more at the center of the

tire

R

Protect the tires from contact with oil, grease

or fuel.

Do not drive with tires that have too little tread

depth. This significantly reduces traction on wet

roads (hydroplaning).

Overview of the tire-change tool kit

On vehicles that have the same size front and

rear wheels, rotate the wheels according to the

intervals in the tire manufacturer's warranty

book in your vehicle documents. If this is not

available, rotate the tires every

3,000 to 6,000 miles (5,000 to 10,000 km),

depending on the wear. Ensure that the direction

of rotation is maintained.

Mercedes-AMG vehicles: observe the notes in

the Supplement. Otherwise, you may fail to rec‐

ognize dangers.

Apart from some country-specific variants, vehi‐

cles are not equipped with a tire-change tool kit.

For more information on which tire-change tools

are required and approved for performing a

wheel change on your vehicle, consult a qualified

specialist workshop.

Observe the instructions and safety notes on

"Changing a wheel" when doing so

(/ page 483).

You require the following tools, for instance, to

change a wheel:

1

2

3

Jack

Ratchet for jack

Lug wrench

R

Jack

Chock

R

Wheels and tires 483

Removing and installing hub caps

R

The required tire-change tool is available. If

your vehicle is not equipped with the tire-

change tool kit, consult a qualified specialist

workshop to find out about suitable tools.

The vehicle is not on a slope.

The vehicle is on solid, non-slippery and level

ground.

4

5

6

Folding chock

Alignment bolt

Socket wrench for ratchet

Requirements:

R

The vehicle is prepared for a wheel change

(/ page 483).

Setting up the folding chock

R

Plastic hub cap

#

To remove: turn the center cover of the hub

cap counter-clockwise and remove the hub

cap.

To install: make sure that the center cover

of the hub cap is turned counter-clockwise.

Position the hub cap and turn the center

cover clockwise until the hub cap engages

physically and audibly.

#

Apply the electric parking brake manually.

Move the front wheels to the straight-ahead

position.

Vehicles with automatic transmission:

Shift into position j.

#

Vehicles with level control system: Set the

normal vehicle level (/ page 216).

#

Switch off the engine.

Make sure that the engine cannot be started.

Place chocks or other suitable items under

the front and rear of the wheel that is diago‐

nally opposite the wheel you wish to change.

#

Remove the hub caps if necessary

Preparing the vehicle for a wheel change

Requirements:

(/ page 483).

Raise the vehicle (/ page 484).

484 Wheels and tires

#

Aluminum hub cap

R

Attach wheel wrench 3 to socket 2 and

tighten the hub cap clockwise.

Specified tightening torque: 18 lb-ft

(25 Nm).

The foot of the jack must be positioned verti‐

cally under the jack support point.

Raising the vehicle when changing a wheel

Requirements:

R

There are no persons in the vehicle.

R

The vehicle has been prepared for a wheel

change (/ page 483).

#

To remove: position socket 2 on hub cap

1.

Important notes on using the jack:

Rules of conduct when the vehicle is raised:

R

Use only a vehicle-specific jack that has

R

Never place your hands or feet under the

been approved by Mercedes-Benz to raise

the vehicle.

The jack is only designed for raising and

holding the vehicle for a short time while a

wheel is being changed and not for mainte‐

nance work under the vehicle.

The jack must be placed on a firm, flat and

non-slip surface. If necessary, use a large,

flat, load-bearing, non-slip underlay.

% The socket can be found in the tire-change

vehicle.

tool kit.

R

Never lie under the vehicle.

Do not start the engine and do not release

the electric parking brake.

Do not open or close any doors or the tail‐

gate.

R

#

Position wheel wrench 3 on socket 2.

Using wheel wrench 3, turn hub cap 1

counter-clockwise and remove it.

R

#

To install: position hub cap 1 and turn until

R

it is completely flush with the wheel.

Position socket 2 on hub cap 1.

Wheels and tires 485

NOTE Vehicle damage from the jack

*

If you do not position the jack correctly at

the appropriate jack support point of the

vehicle, the jack could tip over with the vehi‐

cle raised.

#

The jack is designed exclusively for

jacking up the vehicle at the jack sup‐

port points.

#

Take the ratchet out of the tire-change tool

kit and place it on the hexagon nut of the

jack so that the letters "AUF" are visible.

#

Using the lug wrench, loosen the wheel bolts

on the wheel you wish to change by about

one full turn. Do not unscrew the bolts com‐

pletely.

Position of jack support points

&

WARNING Risk of injury from incorrect

positioning of the jack

If you do not position the jack correctly at

the appropriate jacking point of the vehicle,

the jack could tip with the vehicle raised.

#

Only position the jack at the appropri‐

ate jacking point of the vehicle. The

base of the jack must be positioned

vertically under the jacking point of the

vehicle.

486 Wheels and tires

Removing a wheel

Requirements:

R

The vehicle is raised (/ page 484).

Mercedes-AMG vehicles: observe the notes in

the Supplement. Otherwise, you may fail to rec‐

ognize dangers.

When changing a wheel, avoid applying any force

to the brake discs, since this could impair the

level of comfort when braking.

#

Screw alignment bolt 1 into the thread

instead of the wheel bolt.

NOTE Damage to threading from dirt on

wheel bolts

*

Unscrew the remaining wheel bolts com‐

pletely.

Remove the wheel.

#

Do not place wheel bolts in sand or on

a dirty surface.

#

Position jack 2 at jack support point 1.

Install the new wheel (/ page 486).

#

Unscrew the uppermost wheel bolt com‐

pletely.

#

Turn ratchet 3 clockwise until jack 2 sits

completely on jack support point 1 and the

Mounting a new wheel

Requirements:

base of the jack lies evenly on the ground.

#

Turn ratchet 3 until the tire is raised a maxi‐

mum of 1.2 in (3 cm) from the ground.

R

The wheel is removed (/ page 486).

#

Loosen and remove the wheel (/ page 486).

Wheels and tires 487

Mercedes-AMG vehicles: observe the notes in

the Supplement. Otherwise, you may not recog‐

nize dangers.

For tires with a specified direction of rotation, an

arrow on the side wall of the tire indicates the

correct direction of rotation. Observe the direc‐

tion of rotation when installing.

NOTE Damage to paintwork of the wheel

*

rim when screwing on the first wheel bolt

If the wheel has too much play when screw‐

ing in the first wheel bolt, the wheel rim paint

can be damaged.

&

WARNING Risk of accident from losing a

wheel

#

Slide the wheel to be mounted onto the

alignment bolt and push it on.

#

Press the wheel firmly against the

wheel hub when screwing on the first

wheel bolt.

Oiled, greased or damaged wheel bolt/wheel

nut threads or wheel hub/wheel mounting

bolt threads can cause the wheel bolts/

wheel nuts to come loose.

As a result, you could lose a wheel while driv‐

ing.

&

WARNING Risk of injury from tightening

wheel bolts and nuts

If you tighten the wheel bolts or wheel nuts

when the vehicle is raised, the jack could tip.

#

Tighten the wheel bolts evenly in a diagonal

pattern in the order indicated until they are

finger-tight.

Unscrew the alignment bolt.

Tighten the last wheel bolt until it is finger-

tight.

#

Only tighten wheel bolts or wheel nuts

when the vehicle is on the ground.

#

Never oil or grease the threads.

#

In the event of damage to the threads,

#

Be sure to observe the instructions and

safety notes on "Changing a wheel"

(/ page 479).

contact a qualified specialist workshop

immediately.

#

Lower the vehicle (/ page 487).

#

Have the damaged wheel bolts or dam‐

aged hub threads replaced.

#

For safety reasons, only use wheel bolts

which have been approved by Mercedes-

Benz and for the wheel in question.

Lowering the vehicle after a wheel change

Requirements:

#

Do not continue driving.

#

Observe the information on the choice of

tires (/ page 479).

R

The new wheel has been installed

(/ page 486).

488 Wheels and tires

#

Vehicles with a tire pressure monitoring

system: Restart the tire pressure monitoring

system (/ page 465).

Exception: the new wheel is an emergency

spare wheel.

Place the ratchet onto the hexagon nut of the

&

WARNING Risk of injury through incor‐

jack so that the letters "AB" are visible.

rect tightening torque

#

To lower the vehicle: turn the ratchet of the

jack counter-clockwise.

The wheels could come loose if the wheel

bolts or wheel nuts are not tightened to the

prescribed tightening torque.

Make sure to observe the following further rela‐

ted subject:

#

Make sure the wheel bolts or wheel

nuts are tightened to the prescribed

tightening torque.

R

Notes on tire pressure (/ page 460)

#

If you are not sure, do not move the

Emergency spare wheel

Notes on the emergency spare wheel

vehicle. Consult a qualified specialist

workshop and have the tightening tor‐

que checked immediately.

&

WARNING Risk of accident caused by

incorrect wheel and tire dimensions

#

Check the tire pressure of the newly moun‐

ted wheel and adjust accordingly.

#

Tighten the wheel bolts evenly in a diagonal

The wheel or tire size and the tire type of the

emergency spare wheel or spare wheel and

the wheel to be replaced may differ. Mount‐

ing an emergency spare wheel/spare wheel

may severely impair the driving characteris‐

tics.

pattern in the order indicated 1 to 5 with

#

Vehicles with tire pressure loss warning

system: Restart the tire pressure loss warn‐

ing system (/ page 466).

Exception: the new wheel is an emergency

spare wheel.

a maximum of 59 lb-ft (80 Nm).

#

Tighten the wheel bolts evenly in a diagonal

pattern in the order indicated 1 to 5 to

the specified tightening torque of 111 lb-ft

(150 Nm).

To prevent hazardous situations:

Wheels and tires 489

Removing the emergency spare wheel

Replace the emergency spare wheel after six

years at the latest, regardless of wear.

#

Adapt your driving style accordingly and

drive carefully.

Never mount more than one emergency

spare wheel or spare wheel that differs

in size.

Only use an emergency spare wheel or

spare wheel of a different size briefly.

Do not switch off ESP^®.

>Have the emergency spare wheel or

spare wheel of a different size replaced

at the nearest qualified specialist work‐

shop. The new wheel must have the

correct dimensions.

The emergency spare wheel is fastened in the

cargo compartment under the cargo compart‐

ment floor.

Vehicles with a tire pressure loss warn‐

ing system: If an emergency spare wheel is

installed the tire pressure loss warning sys‐

tem cannot function reliably. Only restart the

system again when the emergency spare

wheel has been replaced with a new wheel.

Vehicles with a tire pressure monitoring

system: If an emergency spare wheel is

installed the tire pressure monitoring system

cannot function reliably. For a few minutes

after an emergency spare wheel is installed,

the system may still display the tire pressure

of the removed wheel. Only restart the sys‐

tem again when the emergency spare wheel

has been replaced with a new wheel.

%

#

Observe the information on mounting tires

(/ page 479).

#

Open the tailgate.

#

Open the cargo compartment floor.

#

Remove the emergency spare wheel.

Inflating the emergency spare wheel

NOTE Overheating due to the tire infla‐

tion compressor running too long

*

Check the tire pressure of the emergency spare

wheel installed. Correct the pressure as neces‐

sary.

The maximum permissible speed with an emer‐

gency spare wheel installed is 50 mph

(80 km/h).

#

Do not run the tire inflation compressor

for longer than ten minutes without

interruption.

Be sure to also observe the following further

related subjects:

R

Notes on tire pressure (/ page 460)

Requirements:

R

Tire and Loading Information placard

(/ page 467)

R

Comply with the manufacturer's safety notes

Do not install the emergency spare wheel with

snow chains.

on the sticker of the emergency spare wheel

and on the tire inflation compressor.

R

Tire pressure table (/ page 461)

490 Wheels and tires

R

Remove the tire inflation compressor from

12 V socket:

the stowage space under the trunk floor

Observe the notes on the cigarette lighter:

(/ page 124)

(/ page 439).

R

Observe the notes on sockets:

#

Turn the SmartKey to position 1 in the igni‐

tion lock.

#

Press on and off switch 5 on the tire infla‐

tion compressor to I.

The tire inflation compressor is switched on.

The tire is inflated. The tire pressure is

shown on manometer 6.

Pump the tire to the specified tire pressure.

The specified tire pressure is stated on the

label of the emergency spare wheel.

When the specified tire pressure has been

reached, press on and off switch 5 on the

tire inflation compressor to 0.

The tire inflation compressor is switched off.

Turn the SmartKey to position g in the igni‐

tion lock.

If the tire pressure is higher than the speci‐

fied pressure, press pressure release valve

#

Pull filler hose 2 and plug 4 out of the tire

inflation compressor housing.

Insert plug 8 of filler hose 2 in the socket

on the tire inflation compressor and then

turn it until plug 8 engages.

Unscrew the cap from the valve on the emer‐

gency spare wheel.

Screw union nut 3 of filler hose 2 onto the

valve.

Make sure on and off switch 5 of the tire

inflation compressor is set to 0.

Insert plug 4 in a socket in your vehicle.

Cigarette lighter socket: (/ page 124)

#

Remove sticker 1 from the tire inflation

compressor housing and affix it to the instru‐

ment cluster within the driver's field of

vision.

#

R

Wheels and tires 491

button 7 until the correct tire pressure has

been reached.

#

Unscrew union nut 3 of filler hose 2 from

the valve.

Screw the valve cap of the emergency spare

wheel onto the valve again.

Stow filler hose 2 and plug 4 in the lower

section of the compressor housing.

Stow the tire inflation compressor in the

vehicle.

Wheels and tires for Your Mercedes GLC Class SUV First Generation (2015-2021)

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