Get MOBILITY -> Wheels and tires Guide for BMW Z4 2 Door First Generation (2002-2008)

Wheels and tires

MOBILITY

Wheels and tires

Tire inflation pressure

specifications

Vehicle features and

options

In the tire inflation pressure table

The tire inflation pressure table, refer to

page 254, contains all tire inflation pressure

specifications for the specified tire sizes at the

ambient temperature. The tire inflation pressure

values apply to tire sizes approved by the manu‐

facturer of the vehicle for the vehicle type.

This chapter describes all standard, country-spe‐

cific and optional features offered with the series.

It also describes features and functions that are

not necessarily available in your vehicle, e.g., due

to the selected options or country versions. This

also applies to safety-related functions and sys‐

tems. When using these functions and systems,

the applicable laws and regulations must be ob‐

served.

To identify the correct tire inflation pressure,

please note the following:

▷ Tire sizes of your vehicle.

▷ Maximum permitted driving speed.

Tire inflation pressure

On the Control Display

General information

The tire characteristics and tire inflation pressure

influence the following:

The current tire inflation pressure values and the

intended tire inflation pressure values for the

mounted tires can be displayed on the Control

Display.

▷ The service life of the tires.

▷ Road safety.

To ensure that they are displayed correctly, the

tire sizes must be stored in the system and must

have been set, refer to page 265, for the

mounted tires.

▷ Driving comfort.

▷ Fuel consumption.

The current tire inflation pressure value is lo‐

cated on each tire.

Safety information

The reference tire inflation pressure value is lo‐

cated in the lower area of the Control Display.

Warning

A tire with too little or no tire inflation pressure

may heat up significantly and sustain damage.

This will have a negative impact on aspects of

handling, such as steering and braking re‐

sponse. There is a risk of accident. Regularly

check the tire inflation pressure, and correct it

as needed, for instance twice a month and be‐

fore a long trip.

Checking the tire inflation

pressure

General information

Tires heat up while driving. The tire inflation

pressure increases with the tire temperature.

Tires have a natural, consistent loss of tire infla‐

tion pressure.

The displays of inflation devices may under-read

by up to 0.1 bar/2 psi.

252

Wheels and tires

MOBILITY

Checking using tire inflation

pressure specifications in the tire

inflation pressure table

After correcting the tire inflation

pressure

With runflat tires:

The tire inflation pressure specifications in the

tire inflation pressure table only relate to cold

tires or tires at the same temperature as the am‐

bient temperature.

Reinitialize the Flat Tire Monitor.

With Tire Pressure Monitor TPM:

The corrected tire inflation pressures are applied

automatically. Make sure that the correct tire set‐

tings have been made.

Only check the tire inflation pressure levels when

the tires are cold, i.e.:

With tires that cannot be found in the tire pres‐

sure values on the Control Display, reset the Tire

Pressure Monitor TPM.

▷ Driving range of max. 1.25 miles/2 km has not

been exceeded.

▷ If the vehicle has not moved again for at least

2 hours after a trip.

Tire inflation pressures up to

100 mph/160 km/h

For speeds of up to 100 mph/160 km/h and for

optimum driving comfort, note the pressure val‐

ues in the tire inflation pressure table, refer to

page 254, and adjust as necessary.

Check the tire inflation pressure of the emer‐

gency wheel in the cargo area regularly, and cor‐

rect it as needed.

1. Determine, refer to page 252, the intended

tire inflation pressure levels for the mounted

tires.

2. Check the tire inflation pressure in all four

tires, using a pressure gage, for example.

3. Correct the tire inflation pressure if the cur‐

rent tire inflation pressure value deviates from

the specified value.

4. Check whether all valve caps are screwed

onto the tire valves.

These pressure values can also be found on the

tire inflation pressure label on the driver's door

pillar.

Checking using the tire inflation

pressure specifications on the

Control Display

Via iDrive:

Do not exceed a speed of 100 mph/160 km/h.

1. "CAR"

2. "Vehicle status"

3.

"Tire Pressure Monitor"

4. Check whether the current tire inflation pres‐

sure levels deviate from the intended tire

pressure value.

5. Correct the tire inflation pressure if the cur‐

rent tire inflation pressure value deviates from

the intended value.

253

Wheels and tires

MOBILITY

Z4 M40i

Tire inflation pressure values up

to 100 mph/160 km/h

Tire size

Pressure specifications in

bar/PSI

Z4 sDrive30i

Specifications

in bar/PSI with

cold tires

Tire size

Pressure specifications

in bar/PSI

Specifications in

bar/PSI with

cold tires

225/50 R 17 98 2.2 / 32

H M+S XL

2.2 / 32

Std/RSC

225/50 R 17 98 2.2 / 32

H M+S XL

Std/RSC

2.2 / 32

255/40 R 18 99 2.2 / 32

V M+S XL Std

2.2 / 32

Front: 255/40

2.2 / 32

-

255/40 R 18 99 2.2 / 32

V M+S XL Std

2.2 / 32

ZR 18 95 Y Std

Rear: 275/40

-

2.2 / 32

-

Front: 255/40

2.2 / 32

-

ZR 18 99 Y Std

ZR 18 95 Y Std

Front: 255/35

ZR 19 96 Y XL

Std

2.2 / 32

Rear: 275/40 ZR -

18 99 Y Std

2.2 / 32

-

Front: 225/45

ZR 18 95 Y XL

Std

2.2 / 32

Rear: 275/35

ZR 19 100 Y

XL Std

-

2.2 / 32

Rear: 255/40 ZR -

18 99 Y XL Std

2.2 / 32

-

Emergency

wheel:

Speed up to a max. of

50 mph / 80 km/h

T 135/90 R 17 4.2 / 60

104 M

Front: 255/35

ZR 19 96 Y XL

Std

2.2 / 32

Tire inflation pressures at max.

speeds above 100 mph/160 km/h

Rear: 275/35 ZR -

19 100 Y XL

Std

2.2 / 32

Warning

Emergency

wheel:

Speed up to a max. of

50 mph / 80 km/h

In order to drive at maximum speeds in excess

of 100 mph/160 km/h, please observe, and, if

necessary, adjust tire pressures for speeds ex‐

ceeding 100 mph/160 km/h from the relevant

table on the following pages. Otherwise, tire

damage and accidents could occur.

T 135/90 R 17

104 M

4.2 / 60

254

Wheels and tires

MOBILITY

For speeds over 100 mph/160 km/h and for opti‐

mum driving comfort, note the pressure values in

the tire inflation pressure table, refer to

Tire size

Pressure specifications

in bar/PSI

Rear: 275/35 ZR -

19 100 Y XL

Std

2.2 / 32

page 255, and adjust as necessary.

Tire inflation pressure values

over 100 mph/160 km/h

Emergency

wheel:

Speed up to a max. of

50 mph / 80 km/h

Z4 sDrive30i

T 135/90 R 17

104 M

4.2 / 60

Tire size

Pressure specifications

in bar/PSI

Z4 M40i

Specifications in

bar/PSI with

cold tires

Tire size

Pressure specifications in

bar/PSI

Specifications

in bar/PSI with

cold tires

225/50 R 17 98 2.2 / 32

H M+S XL

2.2 / 32

Std/RSC

255/40 R 18 99 2.2 / 32

V M+S XL Std

2.4 / 35

225/50 R 17 98 2.2 / 32

H M+S XL

2.2 / 32

Std/RSC

Front: 255/40

2.2 / 32

-

ZR 18 95 Y Std

255/40 R 18 99 2.2 / 32

V M+S XL Std

2.4 / 35

Rear: 275/40 ZR -

18 99 Y Std

2.2 / 32

-

Front: 255/40

2.2 / 32

-

ZR 18 95 Y Std

Front: 225/45

ZR 18 95 Y XL

Std

2.2 / 32

Rear: 275/40

-

2.2 / 32

-

ZR 18 99 Y Std

Rear: 255/40 ZR -

18 99 Y XL Std

2.2 / 32

-

Front: 255/35

ZR 19 96 Y XL

Std

2.2 / 32

Front: 255/35

ZR 19 96 Y XL

Std

2.2 / 32

Rear: 275/35

ZR 19 100 Y

XL Std

-

2.2 / 32

Emergency

wheel:

Speed up to a max. of

50 mph / 80 km/h

T 135/90 R 17 4.2 / 60

104 M

255

Wheels and tires

MOBILITY

Tire age

Tire identification marks

Recommendation

Regardless of the tire tread, replace tires at least

every 6 years.

Tire size

245/45 R 18 96 Y

245: nominal width in mm

45: aspect ratio in %

Manufacture date

You can find the manufacture date of the tire on

the tire's sidewall.

R: radial tire code

18: rim diameter in inches

96: load rating, not for ZR tires

Y: speed rating, before the R on ZR tires

Designation

Manufacture date

DOT … 0119

1st week, 2019

Maximum tire load

Maximum tire load is the maximum permissible

weight for which the tire is approved.

Uniform Tire Quality Grading

Quality grades can be found where applicable on

the tire sidewall between tread shoulder and

maximum section width.

Locate the maximum tire load on the tire sidewall

and the Gross Axle Weight Rating – GAWR – on

the certification label on the driver door B-pillar.

Divide the tire load by 1.1. It must be greater

than one-half of the vehicle’s Gross Axle Weight

Rating – GAWR. Note, front vs. rear GAWR and

tire loads, respectively.

E.g.: Treadwear 200; Traction AA; Temperature

A

DOT Quality Grades

Treadwear

Traction AA A B C

Temperature A B C

Speed letter

Q = up to 100 mph/160 km/h

R = up to 106 mph/170 km/h

S = up to 112 mph/180 km/h

T = up to 118 mph/190 km/h

H = up to 131 mph/210 km/h

V = up to 150 mph/240 km/h

W = up to 167 mph/270 km/h

Y = up to 186 mph/300 km/h

All passenger vehicle tires must conform to Fed‐

eral Safety Requirements in addition to these

grades.

Treadwear

The treadwear grade is a comparative rating

based on the wear rate of the tire when tested

under controlled conditions on a specified gov‐

ernment test course. E.g., a tire graded 150

would wear one and one-half, 1 g, times as well

on the government course as a tire graded 100.

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.

Tire Identification Number

DOT code: DOT xxxx xxx 0119

xxxx: manufacturer code for the tire brand

xxx: tire size and tire design

0119: tire age

Tires with DOT codes meet the guidelines of the

U.S. Department of Transportation.

256

Wheels and tires

MOBILITY

Traction

M+S

The traction grades, from highest to lowest, are

AA, A, B, and C.

Winter and all-season tires with better cold

weather performance than summer tires.

Those grades represent the tire's ability to stop

on wet pavement as measured under controlled

conditions on specified government test surfa‐

ces of asphalt and concrete. A tire marked C may

have poor traction performance.

Tire tread

Summer tires

The traction grade assigned to this tire is based

on straight-ahead braking traction tests, and

does not include acceleration, cornering, hydro‐

planing, or peak traction characteristics.

Do not drive with a tire tread of less than

0.12 in/3 mm, otherwise there is an increased

risk of hydroplaning.

Winter tires

Do not drive with a tire tread of less than

0.16 in/4 mm, as such tires are less suitable for

winter operation.

Temperature

The temperature grades are A, the highest, B,

and C, representing 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. Sustained

high temperature can cause the material of the

tire to degenerate and reduce tire life, and exces‐

sive temperature can lead to sudden tire failure.

The grade C corresponds to a level of perform‐

ance which all passenger car tires must meet un‐

der the Federal Motor Vehicle Safety Standard

No. 109. Grades Band A represent higher levels

of performance on the laboratory test wheel than

the minimum required by law.

Minimum tread depth

Wear indicators are distributed around the tire's

circumference and have the legally required min‐

imum height of 0.063 inches/1.6 mm.

Warning

The temperature grade for this tire is estab‐

lished for a tire that is properly inflated and not

overloaded. Excessive speed, underinflation, or

excessive loading, either separately or in com‐

bination, can cause heat buildup and possible

tire failure.

The positions of the wear indicators are marked

on the tire sidewall with TWI, Tread Wear Indica‐

tor.

Tire damage

RSC – Run-flat tires

Run-flat tires, refer to page 260, are labeled with

a circular symbol containing the letters RSC

marked on the sidewall.

General information

Inspect your tires regularly for damage, foreign

objects lodged in the tread, and tread wear.

Driving over rough or damaged road surfaces, as

well as debris, curbs and other obstacles can

257

Wheels and tires

MOBILITY

cause serious damage to wheels, tires and sus‐

pension parts. This is more likely to occur with

low-profile tires, which provide less cushioning

between the wheel and the road. Be careful to

avoid road hazards and reduce your speed, es‐

pecially if your vehicle is equipped with low-pro‐

file tires.

ger of accidents and property damage. If possi‐

ble, avoid driving over objects or road condi‐

tions that may damage tires, or drive over them

slowly and carefully.

Changing wheels and tires

Indications of tire damage or other vehicle mal‐

functions:

Mounting and wheel balancing

▷ Unusual vibrations.

Have mounting and wheel balancing carried out

by a dealer’s service center or another qualified

service center or repair shop.

▷ Unusual tire or running noises.

▷ Unusual handling such as a strong tendency

to pull to the left or right.

Damage can be caused by the following situa‐

tions, for instance:

Wheel and tire combination

General information

▷ Driving over curbs.

▷ Road damage.

You can ask the dealer's service center or an‐

other qualified service center or repair shop

about the correct wheel/tire combination and

wheel rim versions for the vehicle.

▷ Tire inflation pressure too low.

▷ Vehicle overloading.

▷ Incorrect tire storage.

Safety information

Warning

Wheels and tires which are not suitable for your

vehicle can damage parts of the vehicle, for in‐

stance due to contact with the body due to tol‐

erances despite the same official size rating.

There is a risk of an accident. The manufac‐

turer of your vehicle strongly suggests that you

use wheels and tires that have been recom‐

mended by the vehicle manufacturer for your

vehicle type.

Damaged tires can lose tire inflation pressure,

which can lead to loss of vehicle control. There

is a risk of accident. If tire damage is suspected

while driving, immediately reduce speed and

stop. Have wheels and tires checked. For this

purpose, drive carefully to the nearest dealer’s

service center or another qualified service cen‐

ter or repair shop. Have vehicle towed or trans‐

ported as needed. Do not repair damaged tires,

but have them replaced.

Warning

Mounted steel wheels can cause technical

problems, for instance independent loosening

of the lug bolts, damage to the brake discs.

There is a risk of accident. Do not mount steel

wheels.

Warning

Tires can become damaged by driving over ob‐

stacles, e.g., curbs or road damage, at high

speed. Larger wheels have a smaller tire cross-

section. The smaller the tire cross-section, the

higher the risk of tire damage. There is a dan‐

258

Wheels and tires

MOBILITY

Retreaded tires

Warning

Incorrect wheel/tire combinations will have a

negative impact on the vehicle's handling and

on the function of a variety of systems, such as

the Anti-lock Brake System or Dynamic Stabil‐

ity Control. There is a risk of accident. To main‐

tain good handling and vehicle response, use

only tires with a single tread configuration from

a single manufacturer. The manufacturer of the

vehicle recommends that you use wheels and

tires that have been recommended by the vehi‐

cle manufacturer for your vehicle type. Follow‐

ing tire damage, have the original wheel/tire

combination remounted on the vehicle as soon

as possible.

Warning

Retreaded tires can have different tire casing

structures. With advanced age the service life

can be limited. There is a risk of an accident.

The manufacturer of your vehicle does not rec‐

ommend the use of retreaded tires.

The manufacturer of the vehicle does not rec‐

ommend the use of retreaded tires.

Winter tires

General information

Winter tires are recommended for operating on

winter roads.

Recommended tire brands

Although so-called all-season M+S tires provide

better winter traction than summer tires, they

usually do not provide the same level of perform‐

ance as winter tires.

Maximum speed of winter tires

If the maximum speed of the vehicle is higher

than the permissible speed for the winter tires,

then attach a label showing the permissible maxi‐

mum speed in the field of view. The label is avail‐

able from a dealer's service center or another

qualified service center or repair shop.

For each tire size, the manufacturer of the vehi‐

cle recommends certain tire brands. The tire

brands can be identified by a star on the tire

sidewall.

With winter tires mounted, observe and do not

exceed the permissible maximum speed.

Changing runflat tires

New tires

For your own safety, use only runflat tires. No

spare tire is available in the case of a flat tire. Fur‐

ther information is available from a dealer's serv‐

ice center or another qualified service center or

repair shop.

Tire traction is not optimal due to manufacturing

circumstances when tires are brand-new; they

achieve their full traction potential after a break-in

time.

Drive conservatively for the first

200 miles/300 km.

Rotating wheels between axles

Swapping the front wheels with the rear wheels

or vice versa is not permitted on vehicles with

259

Wheels and tires

MOBILITY

different tire or rim dimensions on the front and

rear axles.

self-steering properties will change. There is a

risk of accident. Drive moderately and do not

exceed a speed of 50 mph/80 km/h.

Storing tires

Label

Tire inflation pressure

Do not exceed the maximum tire inflation pres‐

sure indicated on the side wall of the tire.

Storage

Store wheels and tires in a cool, dry and dark

place.

Always protect tires against all contact with oil,

grease, and solvents.

Do not leave tires in plastic bags.

Remove dirt from wheels or tires.

The tires are marked on the tire sidewall with

RSC Run-flat System Component.

Run-flat tires

Repairing a flat tire

Concept

Run-flat tires permit continued driving under re‐

stricted conditions even in the event of a com‐

plete loss of tire inflation pressure.

Safety measures

▷ Park the vehicle as far away as possible from

passing traffic and on solid ground.

▷ Switch on the hazard warning system.

▷ Secure the vehicle against rolling away by

setting the parking brake.

General information

The wheels consist of tires that are self-support‐

ing, to a limited degree, and possibly special

rims.

▷ Turn the steering wheel until the front wheels

are in the straight-ahead position and engage

the steering wheel lock.

The support of the sidewall allows the tire to re‐

main drivable to a restricted degree in the event

of a tire inflation pressure loss.

▷ Have all vehicle occupants get out of the ve‐

hicle and ensure that they remain outside the

immediate area in a safe place, such as be‐

hind a guardrail.

Follow the instructions for continued driving with

a flat tire.

▷ If necessary, set up a warning triangle at an

appropriate distance.

Safety information

Warning

Your vehicle handles differently with a run-flat

tire with no or low inflation pressure; for in‐

stance, your lane stability when braking is re‐

duced, braking distances are longer and the

260

Wheels and tires

MOBILITY

Overview

Storage

Mobility System

Concept

With the Mobility System, minor tire damage can

be sealed temporarily to enable continued travel.

To accomplish this, sealant is pumped into the

tires, which seals the damage from the inside.

General information

▷ Follow the instructions on using the Mobility

System found on the compressor and sealant

container.

The Mobility System is located in the right stor‐

age compartment of the cargo area.

▷ Use of the Mobility System may be ineffec‐

tive if the tire puncture measures approx.

1/8 inches/4 mm or more.

Sealant container

▷ Contact a dealer's service center or another

qualified service center or repair shop if the

tire cannot be made drivable.

▷ If possible, do not remove foreign bodies that

have penetrated the tire. Only remove foreign

objects if they are visibly protruding from the

tire.

▷ Pull the speed limit sticker off the sealant

container and apply it to the steering wheel.

▷ The use of a sealant can damage the TPM

wheel electronics. In this case, have the elec‐

tronics checked and replaced at the next op‐

portunity.

▷ Sealant container, arrow 1.

▷ Filling hose, arrow 2.

Observe use-by date on the sealant container.

▷ The compressor can be used to check the

tire inflation pressure.

Compressor

1

2

Sealant container unlocking

Sealant container holder

261

Wheels and tires

MOBILITY

3

4

5

6

7

8

Tire pressure gage

NOTICE

Reduce tire inflation pressure button

On/off switch

The compressor can overheat during extended

operation. There is a risk of damage to prop‐

erty. Do not run the compressor for more than

10 minutes.

Compressor

Connector/cable for socket

Connection hose

Filling

1. Shake the sealant container.

Safety measures

▷ Park the vehicle as far away as possible from

passing traffic and on solid ground.

▷ Switch on the hazard warning system.

▷ Secure the vehicle against rolling away by

setting the parking brake.

▷ Turn the steering wheel until the front wheels

are in the straight-ahead position and engage

the steering wheel lock.

▷ Have all vehicle occupants get out of the ve‐

hicle and ensure that they remain outside the

immediate area in a safe place, such as be‐

hind a guardrail.

2. Pull filling hose completely out of the cover of

the sealant container. Do not kink the hose.

▷ If necessary, set up a warning triangle at an

appropriate distance.

Filling the tire with sealant

Safety information

DANGER

3. Slide the sealant container into the holder on

the compressor housing, ensuring that it en‐

gages audibly.

If the exhaust pipe is blocked or ventilation is in‐

sufficient, harmful exhaust gases can enter into

the vehicle. The exhaust gases contain pollu‐

tants which are colorless and odorless. In en‐

closed areas, exhaust gases can also accumu‐

late outside of the vehicle. There is danger to

life. Keep the exhaust pipe free and ensure suf‐

ficient ventilation.

262

Wheels and tires

MOBILITY

4. Screw the filling hose of the sealant container

onto the tire valve of the nonworking wheel.

Checking and adjusting the tire

inflation pressure

Checking

1. Switch off the compressor.

2. Read the tire inflation pressure on the tire

pressure gage.

To continue the trip, a tire inflation pressure of at

least 2 bar must be reached.

Removing and stowing the sealant

container

1. Unscrew the filling hose of the sealant con‐

tainer from the tire valve.

5. With the compressor switched off, insert the

plug into the power socket inside the vehicle.

2. Press the red unlocking device.

3. Remove the sealant container from the com‐

pressor.

4. Wrap and store the sealant container in suita‐

ble material to avoid dirtying the cargo area.

Minimum tire inflation pressure is

not reached

1. Pull the connector out of the power socket

inside the vehicle.

6. With standby state switched on or the engine

running, switch on the compressor.

2. Drive 33 ft/10 m forward and back to distrib‐

ute the sealant in the tire.

3. Screw the connection hose of the compres‐

sor directly onto the tire valve stem.

Let the compressor run for max. 10 minutes to fill

the tire with sealant and achieve a tire inflation

pressure of approx. 2.0 bar.

While the tire is being filled with sealant, the tire

inflation pressure may sporadically reach approx.

5 bar. Do not switch off the compressor at this

point.

263

Wheels and tires

MOBILITY

4. Insert the connector into the power socket in‐

side the vehicle.

Adjustment

1. Stop at a suitable location.

2. Screw the connection hose of the compres‐

sor directly onto the tire valve stem.

5. With standby state switched on or the engine

running, switch on the compressor.

If a tire inflation pressure of at least 2 bar can‐

not be reached, contact your dealer's service

center or another qualified service center or

repair shop.

3. Insert the connector into the power socket in‐

side the vehicle.

If a tire inflation pressure of at least 2 bar is

reached, see Minimum tire inflation pressure

is reached.

6. Unscrew the connection hose of the com‐

pressor from the tire valve.

7. Pull the connector out of the power socket

inside the vehicle.

8. Stow the Mobility System in the vehicle.

4. Correct the tire inflation pressure to at least

2.0 bar.

Minimum tire inflation pressure is

reached

1. Unscrew the connection hose of the com‐

pressor from the tire valve.

▷ Increase tire inflation pressure: with

standby state switched on or the engine

running, switch on the compressor.

▷ Reduce tire inflation pressure: press the

button on the compressor.

2. Pull the connector out of the power socket

inside the vehicle.

5. Unscrew the connection hose of the com‐

pressor from the tire valve.

3. Stow the Mobility System in the vehicle.

6. Pull the connector out of the power socket

inside the vehicle.

4. Immediately drive approx. 5 miles/10 km to

ensure that the sealant is evenly distributed in

the tire.

7. Stow the Mobility System in the vehicle.

Do not exceed a speed of 50 mph/80 km/h.

Continuing the trip

Do not exceed the maximum permissible speed

of 50 mph/80 km/h.

If possible, do not drive at speeds less than

12 mph/20 km/h.

Reinitialize the run-flat tires, refer to page 272.

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Wheels and tires

MOBILITY

Reset the Tire Pressure Monitor TPM, refer to

page 265.

▷ 255/40 R18.

Follow the snow chain manufacturer's instruc‐

tions.

Replace the nonworking tire and the sealant con‐

tainer of the Mobility System promptly.

Do not initialize the Flat Tire Monitor after

mounting snow chains, as doing so may result in

incorrect readings.

Snow chains

Safety information

Warning

Do not reset the Tire Pressure Monitor TPM af‐

ter mounting snow chains, as doing so may re‐

sult in incorrect readings.

When driving with snow chains, briefly activate

Dynamic Traction Control DTC to optimize the

forward momentum.

With the mounting of snow chains on unsuita‐

ble tires, the snow chains can come into con‐

tact with vehicle parts. There may be a risk of

accident or risk of damage to property. Only

mount snow chains on tires that are designated

by their manufacturer as suitable for the use of

snow chains.

Maximum speed with snow

chains

Do not exceed a speed of 30 mph/50 km/h when

using snow chains.

Tire Pressure Monitor TPM

Warning

Insufficiently tight snow chains may damage

tires and vehicle components. There may be a

risk of accident or risk of damage to property.

Make sure that the snow chains are always suf‐

ficiently tight. Re-tighten as needed according

to the snow chain manufacturer's instructions.

Concept

The system monitors tire inflation pressure in the

four mounted tires. The system warns you if

there is a loss of pressure in one or more tires.

General information

Sensors in the tire valves measure the tire infla‐

tion pressure and tire temperature.

Fine-link snow chains

The system detects the mounted tires automati‐

cally. The system displays the specified nominal

pressure values on the Control Display and com‐

pares these values to the actual tire pressure val‐

ues.

The manufacturer of the vehicle recommends

the use of fine-link snow chains. Certain types of

fine-link snow chains have been tested by the

manufacturer of the vehicle and recommended

as road-safe and suitable.

If tires are being used that are not specified on

the tire inflation pressure details on the vehicle,

refer to page 252, such as tires with special ap‐

proval, the system needs to be actively reset.

The system will then take over the actual tire in‐

flation pressures as the target pressures.

Information regarding suitable snow chains is

available from a dealer’s service center or an‐

other qualified service center or repair shop.

Use

Use only in pairs on the rear wheels, equipped

with the tires of the following size:

When operating the system, also note the addi‐

tional information found in the Tire inflation pres‐

sure, refer to page 252, chapter.

▷ 225/50 R17.

265

Wheels and tires

MOBILITY

The tire sizes of the mounted tires can be gath‐

ered from the tire inflation pressure details on the

vehicle, refer to page 252, or directly on the tires.

Safety information

Warning

The tire details do not need to be re-entered

when the tire inflation pressure is corrected.

The display of the target pressures is not a

substitute for the tire inflation pressure details

on the vehicle. Incorrect entries in the tire set‐

tings can lead to incorrect target tire inflation

pressure values. In this case, it cannot be guar‐

anteed that the notification of a loss of tire infla‐

tion pressure will be reliable. There is a risk of

injury and risk of damage to property. Ensure

that the tire sizes of the mounted tires are dis‐

played correctly and match the details on the

tires and on the vehicle.

For summer and winter tires, the tire details en‐

tered last are stored. After a tire or wheel re‐

placement, the settings of the tire sets used last

can be selected.

Opening the menu

Via iDrive:

1. "CAR"

2. "Vehicle status"

3.

"Tire Pressure Monitor"

Functional requirements

The following conditions must be met for the

system; otherwise, reliable flagging of a loss of

tire inflation pressure is not assured:

Changing settings

Via iDrive:

1. "Tire settings"

2. "Tire selection"

3. "Manual"

▷ After each tire or wheel change, the system

detects and updates the mounted tires and

displays them after a short trip on the Control

Display.

4.

▷ "Summer tires"

▷ "Winter/all-year"

Enter the information about the mounted

tires in the tire settings when the system

does not automatically detect the tires.

5. Select the tire type that is mounted on the

rear axle:

▷ For tires with special approval:

▷ Tire size, e.g., 245/45 R18 96 Y.

▷ After a tire or wheel replacement, a reset

was performed with the correct tire infla‐

tion pressure.

▷ For tires with special approval: "Other tire"

6. Select the maximum road speed that will be

used with the tires.

▷ After the tire inflation pressure was ad‐

justed to a new value, a reset was per‐

formed.

7. "Save tire settings"

The measurement of the current tire inflation

pressure is started. The measurement progress

is displayed.

▷ Wheels with TPM wheel electronics.

Tire settings

Status display

Current status

The system status can be displayed on the Con‐

trol Display, e.g., whether or not the system is ac‐

tive.

General information

The information about the mounted tires can be

entered in the tire settings if the system does not

automatically detect the tires.

266

Wheels and tires

MOBILITY

Via iDrive:

Tire conditions

1. "CAR"

General information

2. "Vehicle status"

Tire and system status are indicated by the color

of the wheels and a SMS text message on the

Control Display.

3.

"Tire Pressure Monitor"

The current status is displayed.

Any existing messages may not be deleted if the

displayed target pressure is not reached after the

tire inflation pressure is corrected.

Current tire inflation pressure

The current tire inflation pressure is displayed for

each tire.

All wheels green

▷ The system is active and bases warnings on

the displayed target pressures.

The current tire inflation pressures may change

during driving operation or depending on the ex‐

ternal temperature.

▷ For tires with special approval: the system is

active and bases warnings on the tire inflation

pressures stored during the last reset.

Current tire temperature

Depending on the model, the current tire tem‐

peratures are displayed.

One to four yellow wheels

A flat tire or major drop in the tire inflation pres‐

sure has occurred in the indicated tires.

The current tire temperatures may change while

driving or due to the external temperature.

Target pressure

Gray wheels

It may not be possible to identify tire inflation

pressure losses.

The target pressure for the tires on the front and

rear axles is displayed.

The target pressures are values stored in the ve‐

hicle.

Possible causes:

▷ Malfunction.

The specified target pressures take the influence

of driving operation and external temperature on

the tire temperature into account. The appropri‐

ate target pressure is always displayed, inde‐

pendent of the weather situation, tire tempera‐

tures and driving times.

▷ During tire inflation pressure measurement,

after confirmation of the tire settings.

▷ For tires with special approval: the system is

being reset.

The displayed target pressure may change and

may differ from the tire inflation pressure details

on the door pillar of the driver's door. The tire in‐

flation pressure can thus be corrected to the

value of the displayed target pressures.

For tires with special approval:

perform a reset

Via iDrive:

1. "CAR"

The target pressure is immediately adjusted if

the vehicle load is changed in the tire settings.

2. "Vehicle status"

3. "Tire Pressure Monitor"

4. Switch on drive-ready state and do not drive

off.

5. Reset tire inflation pressure: "Perform reset".

6. Drive away.

267

Wheels and tires

MOBILITY

The wheels are displayed in gray and the follow‐

ing is displayed "Resetting Tire Pressure

Monitor…".

Symbol Possible cause

Inflation was not carried out accord‐

ing to specifications, e.g., when the

tire has not been sufficiently inflated

or in the case of a natural steady tire

pressure loss.

After a travel time of several minutes, the set tire

inflation pressures are accepted as the target tire

inflation pressures. The reset is completed auto‐

matically while driving.

After a successfully completed reset, the wheels

on the Control Display are shown in green and

the following is displayed: "Tire Pressure Monitor

active. See label for recommended pressure.".

Measure

Check the tire pressure and correct as needed.

If the tire inflation pressure is too

low

You may interrupt this trip at any time. When you

continue the reset resumes automatically.

Message

Messages: for tires without

special approval

A yellow warning light is illuminated in

the instrument cluster.

General information

A low tire inflation pressure may cause the DSC

Dynamic Stability Control to be switched on.

In addition, a symbol with a Check Control mes‐

sage appears on the Control Display.

Symbol Possible cause

Safety information

There is a tire inflation pressure loss.

Warning

A damaged regular tire with low or missing tire

inflation pressure impacts handling, such as

steering and braking response. Run-flat tires

can maintain limited stability. There is a risk of

accident. Do not continue driving if the vehicle

is equipped with normal tires. Follow the infor‐

mation on run-flat tires and continued driving

with these tires.

Measure

1. Reduce the vehicle speed. Do not exceed a

speed of 80 mph/130 km/h.

2. At the next opportunity, for instance at a gas

station, check the tire inflation pressure in all

four tires and correct if necessary.

If there is a significant loss of tire

inflation pressure

If a tire inflation pressure check is

required

Message

A yellow warning light is illuminated in

the instrument cluster.

Message

A symbol with a Check Control message ap‐

pears on the Control Display.

In addition, a symbol with the affected tire ap‐

pears in a Check Control message on the Con‐

trol Display.

268

Wheels and tires

MOBILITY

Symbol Possible cause

There is a flat tire or a major loss in

Sym‐

bol

Possible cause

tire inflation pressure.

Inflation was not carried out accord‐

ing to specifications, e.g., the tire has

not been sufficiently inflated.

Measure

The system has detected a wheel

change, but no reset was done.

1. Reduce your speed and stop cautiously.

Avoid sudden braking and steering maneu‐

vers.

The tire inflation pressure has fallen

below the level of the last reset.

2. Check whether the vehicle is fitted with nor‐

mal tires or run-flat tires.

No reset was performed for the sys‐

tem. The system issues a warning

based on the tire inflation pressures

stored during the last reset.

Run-flat tires, refer to page 260, are labeled

with a circular symbol containing the letters

RSC marked on the tire's sidewall.

Measure

Messages: for tires with special

approval

1. Check the tire pressure and correct as

needed.

2. Perform a system reset.

General information

A low tire inflation pressure may cause the DSC

Dynamic Stability Control to be switched on.

If the tire inflation pressure is too

low

Safety information

Message

A yellow warning light is illuminated in

the instrument cluster.

Warning

A damaged regular tire with low or missing tire

inflation pressure impacts handling, such as

steering and braking response. Run-flat tires

can maintain limited stability. There is a risk of

accident. Do not continue driving if the vehicle

is equipped with normal tires. Follow the infor‐

mation on run-flat tires and continued driving

with these tires.

In addition, a symbol with a Check Control mes‐

sage appears on the Control Display.

Symbol Possible cause

There is a tire inflation pressure loss.

No reset was performed for the sys‐

tem. The system issues a warning

based on the tire inflation pressures

stored during the last reset.

If a tire inflation pressure check is

required

Measure

1. Reduce the vehicle speed. Do not exceed a

speed of 80 mph/130 km/h.

Message

A symbol with a Check Control message ap‐

pears on the Control Display.

2. At the next opportunity, for instance at a gas

station, check the tire inflation pressure in all

four tires and correct if necessary.

269

Wheels and tires

MOBILITY

3. Reset the system.

If tire damage cannot be found, contact a

dealer’s service center or another qualified

service center or repair shop.

If there is a significant loss of tire

inflation pressure

2. Repair the flat tire, e.g., with a flat tire kit or by

changing the wheel.

Message

Use of sealant, for instance from the flat tire kit,

may damage the TPM wheel electronics. Have

the electronics replaced at the next opportunity.

A yellow warning light is illuminated in

the instrument cluster.

In addition, a symbol with the affected tire ap‐

pears in a Check Control message on the Con‐

trol Display.

Run-flat tires

Safety information

Symbol Possible cause

Warning

There is a flat tire or a major loss in

tire inflation pressure.

Your vehicle handles differently with a run-flat

tire with no or low inflation pressure; for in‐

stance, your lane stability when braking is re‐

duced, braking distances are longer and the

self-steering properties will change. There is a

risk of accident. Drive moderately and do not

exceed a speed of 50 mph/80 km/h.

No reset was performed for the sys‐

tem. The system issues a warning

based on the tire inflation pressures

stored during the last reset.

Measure

1. Reduce your speed and stop cautiously.

Avoid sudden braking and steering maneu‐

vers.

Maximum speed

You may continue driving with a damaged tire at

speeds up to 50 mph/80 km/h.

2. Check whether the vehicle is fitted with nor‐

mal tires or run-flat tires.

Continued driving with a flat tire

Run-flat tires, refer to page 260, are labeled

with a circular symbol containing the letters

RSC marked on the tire's sidewall.

Follow the following when continuing to drive

with a damaged tire:

1. Avoid sudden braking and steering maneu‐

vers.

Actions in the event of a flat tire

2. Do not exceed a speed of 50 mph/80 km/h.

Normal tires

1. Identify the damaged tire.

3. Check the tire inflation pressure in all four

tires at the next opportunity.

Check the tire inflation pressure in all four

tires, for instance using the tire pressure gage

of a flat tire kit.

For tires with special approval: if the tire infla‐

tion pressure in all four tires is correct, the

Tire Pressure Monitor may not have been re‐

set. In this case, perform the reset.

For tires with special approval: if the tire infla‐

tion pressure in all four tires is correct, the

TPM may not have been reset. In this case,

perform the reset.

270

Wheels and tires

MOBILITY

Possible driving range with a

depressurized tire

These circumstances may cause a warning

when temperatures fall very sharply.

The distance for which it may be possible to

drive safely varies depending on how the vehicle

is loaded and used, e.g., speed, road conditions,

external temperature. The driving range may be

less but may also be more if an economical driv‐

ing style is used.

Following a temperature-related warning, the tar‐

get pressures are displayed on the Control Dis‐

play again after a short distance.

Sudden tire pressure loss

The system cannot indicate sudden serious tire

damage caused by external circumstances.

If the vehicle is loaded with an average weight

and used under favorable conditions, the dis‐

tance for which it may be safe to drive may be up

to 50 miles/80 km.

Failure performing a reset

Tires with special approval: the system will not

function correctly if a reset was not performed,

for example a flat tire may be indicated although

the tire inflation pressures are correct.

Vehicle handling with damaged tires

Vehicles driven with a damaged tire will handle

differently, potentially leading to conditions such

as the following:

Malfunction

Message

▷ Greater likelihood of swerving off course.

▷ Longer braking distances.

▷ Changed self-steering properties.

The yellow warning light flashes and is

then illuminated continuously. A Check

Control message is displayed. It may not

be possible to identify tire pressure losses.

Modify your driving style. Avoid abrupt steering

maneuvers or driving over obstacles, for instance

curbs or potholes.

Final tire failure

Measure

Vibrations or loud noises while driving can indi‐

cate the final failure of a tire.

▷ A wheel without TPM wheel electronics, such

as an emergency wheel, is mounted: have

the wheels checked, if needed.

Reduce speed and stop; otherwise, pieces of the

tire could come loose and cause an accident.

▷ Malfunction: have the system checked.

Do not continue driving. Contact a dealer’s serv‐

ice center or another qualified service center or

repair shop.

▷ Interference caused by systems or devices

with the same radio frequency: after leaving

the area of the interference, the system auto‐

matically becomes active again.

System limits

Temperature

▷ For tires with special approval: the system

was unable to complete the reset. Perform a

system reset again.

The tire inflation pressure depends on the tire's

temperature.

Declaration according to NHTSA/

FMVSS 138 Tire Pressure

Monitoring System

Each tire, including the spare (if provided) should

be checked monthly when cold and inflated to

Driving or exposure to the sun will increase the

tire's temperature, thus increasing the tire infla‐

tion pressure.

The tire inflation pressure is reduced when the

tire temperature falls again.

271

Wheels and tires

MOBILITY

the inflation pressure recommended by the vehi‐

cle manufacturer on the vehicle placard or tire in‐

flation pressure label. (If your vehicle has tires of

a different size than the size indicated on the ve‐

hicle placard or tire inflation pressure label, you

should determine the proper tire inflation pres‐

sure for those tires.) As an added safety feature,

your vehicle has been equipped with a tire pres‐

sure monitoring 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 illumi‐

nates, you should stop and check your tires as

soon as possible, and inflate them to the proper

pressure. Driving on a significantly under-inflated

tire causes the tire to overheat and can lead to

tire failure. Under-inflation also reduces fuel effi‐

ciency and tire tread life, and may affect the vehi‐

cle's handling 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 illu‐

mination of the TPMS low tire pressure telltale.

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 low

tire pressure telltale. When the system detects a

malfunction, the telltale will flash for approxi‐

mately one minute and then remain continuously

illuminated. This sequence will continue upon

subsequent vehicle start-ups as long as the mal‐

function exists. When the malfunction indicator is

illuminated, the system may not be able to de‐

tect or signal low tire pressure as intended.

TPMS malfunctions may occur for a variety of

reasons, including the installation of replacement

or alternate tires or wheels on the vehicle that

prevent the TPMS from functioning properly. Al‐

ways check the TPMS malfunction telltale after

replacing one or more tires or wheels on your ve‐

hicle to ensure that the replacement or alternate

tires and wheels allow the TPMS to continue to

function properly.

Flat Tire Monitor FTM

Concept

The system detects tire inflation pressure loss

on the basis of rotation speed differences be‐

tween the individual wheels while driving.

In the event of a tire inflation pressure loss, the

diameter and therefore the rotational speed of

the corresponding wheel changes. The differ‐

ence will be detected and reported as a flat tire.

The system does not measure the actual infla‐

tion pressure in the tires.

Functional requirements

The following conditions must be met for the

system; otherwise, reliable flagging of a loss of

tire inflation pressure is not assured:

▷ After a tire or wheel replacement, an initializa‐

tion was performed with the correct tire infla‐

tion pressure.

▷ After the tire pressure was adjusted to a new

value, an initialization was performed.

Status display

The current status of the flat tire monitor can be

displayed, for instance whether the RPA is active.

Via iDrive:

1. "CAR"

2. "Vehicle status"

3.

"Flat Tire Monitor"

The status is displayed.

Initialization required

An initialization must be performed in the follow‐

ing situations:

▷ After the tire inflation pressure has been ad‐

justed.

▷ After a tire or wheel replacement.

272

Wheels and tires

MOBILITY

Indication of a flat tire

Performing initialization

When initializing, the set tire inflation pressures

serve as reference values in order to detect a flat

tire. Initialization is started by confirming the tire

inflation pressures.

A yellow warning light is illuminated in

the instrument cluster.

In addition, a symbol with a Check Control mes‐

sage appears on the Control Display.

Do not initialize the system when driving with

snow chains.

Symbol Possible cause

Via iDrive:

There is a flat tire or a major loss in

tire inflation pressure.

1. "CAR"

2. "Vehicle status"

3. "Flat Tire Monitor"

Measure

4. Switch on drive-ready state and do not drive

off.

1. Reduce your speed and stop cautiously.

Avoid sudden braking and steering maneu‐

vers.

5. Start the initialization with: "Perform reset"

6. Drive away.

2. Check whether the vehicle is fitted with nor‐

mal tires or run-flat tires.

The initialization is completed while driving,

which can be interrupted at any time.

Run-flat tires, refer to page 260, are labeled

with a circular symbol containing the letters

RSC marked on the tire's sidewall.

The initialization automatically continues when

driving resumes.

Actions in the event of a flat tire

Messages

Normal tires

1. Identify the damaged tire.

General information

When a flat tire is indicated, DSC Dynamic Sta‐

bility Control is switched on, if needed.

To do this, check the tire inflation pressure in

all four tires, for instance using the tire pres‐

sure gage of a flat tire kit.

Safety information

If the tire inflation pressure in all four tires is

correct, the Flat Tire Monitor may not have

been initialized. In this case, initialize the sys‐

tem.

Warning

A damaged regular tire with low or missing tire

inflation pressure impacts handling, such as

steering and braking response. Run-flat tires

can maintain limited stability. There is a risk of

accident. Do not continue driving if the vehicle

is equipped with normal tires. Follow the infor‐

mation on run-flat tires and continued driving

with these tires.

If identification of flat tire damage is not pos‐

sible, please contact a dealer’s service center

or another qualified service center or repair

shop.

2. Repair the flat tire, e.g., with a flat tire kit or by

changing the wheel.

273

Wheels and tires

MOBILITY

Vehicle handling with damaged tires

Run-flat tires

Vehicles driven with a damaged tire will handle

differently, potentially leading to conditions such

as the following:

Safety information

▷ Greater likelihood of swerving off course.

▷ Longer braking distances.

Warning

Your vehicle handles differently with a run-flat

tire with no or low inflation pressure; for in‐

stance, your lane stability when braking is re‐

duced, braking distances are longer and the

self-steering properties will change. There is a

risk of accident. Drive moderately and do not

exceed a speed of 50 mph/80 km/h.

▷ Changed self-steering properties.

Modify your driving style. Avoid abrupt steering

maneuvers or driving over obstacles, for instance

curbs or potholes.

Final tire failure

Vibrations or loud noises while driving can indi‐

cate the final failure of a tire.

Maximum speed

Reduce speed and stop; otherwise, pieces of the

tire could come loose and cause an accident.

You may continue driving with a damaged tire at

speeds up to 50 mph/80 km/h.

Do not continue driving. Contact a dealer’s serv‐

ice center or another qualified service center or

repair shop.

Continued driving with a flat tire

Follow the following when continuing to drive

with a damaged tire:

System limits

The system could be delayed or malfunction in

the following situations:

1. Avoid sudden braking and steering maneu‐

vers.

2. Do not exceed a speed of 50 mph/80 km/h.

▷ A natural, even tire inflation pressure loss in

all four tires will not be recognized. Therefore,

check the tire inflation pressure regularly.

3. Check the tire inflation pressure in all four

tires at the next opportunity.

If the tire inflation pressure in all four tires is

correct, the Flat Tire Monitor may not have

been initialized. In this case, initialize the sys‐

tem.

▷ Sudden serious tire damage caused by exter‐

nal circumstances cannot be recognized in

advance.

▷ When the system has not been initialized.

Possible driving range with a

depressurized tire

▷ When driving on a snowy or slippery road sur‐

face.

The distance for which it may be possible to

drive safely varies depending on how the vehicle

is loaded and used, e.g., speed, road conditions,

external temperature. The driving range may be

less but may also be more if an economical driv‐

ing style is used.

▷ Sporty driving style: spinning traction wheels,

high lateral acceleration (drifting).

▷ When driving with snow chains.

If the vehicle is loaded with an average weight

and used under favorable conditions, the dis‐

tance for which it may be safe to drive may be up

to 50 miles/80 km.

274

Wheels and tires

MOBILITY

an emergency or spare wheel in the event of a

breakdown.

Changing wheels/tires

General information

When using run-flat tires or a flat tire kit, a wheel

does not always need to be changed immedi‐

ately when there is a loss of tire inflation pressure

due to a flat tire.

Warning

On soft, uneven or slippery ground, for example

snow, ice, tiles, etc., the vehicle jack can slip

away. There is a risk of injury. If possible,

change the wheel on a flat, solid, and slip-re‐

sistant surface.

If needed, the tools for changing wheels are

available as accessories from a dealer’s service

center or another qualified service center or re‐

pair shop.

Warning

Safety information

The vehicle jack is optimized for lifting the vehi‐

cle and for the jacking points on the vehicle

only. There is a risk of injury. Do not lift any

other vehicle or cargo using the vehicle jack.

DANGER

The vehicle jack is only provided for short-term

lifting of the vehicle for wheel changes. Even if

all safety measures are observed, there is a risk

of the raised vehicle falling, if the vehicle jack

tips over. There is a risk of injuries or danger to

life. If the vehicle is raised, do not lie under the

vehicle and do not start the engine.

Warning

If the vehicle jack is not inserted into the jacking

point provided for this purpose, the vehicle may

be damaged or the vehicle jack may slip when

it is being cranked up. There is a risk of injury or

risk of damage to property. When cranking up

the vehicle jack, ensure that it is inserted in the

jacking point next to the wheel housing.

DANGER

Supports such as wooden blocks under the ve‐

hicle jack reduce the capacity of the vehicle

jack to bear weight. They have the potential to

exert too much strain on the vehicle jack, caus‐

ing it to tip over and the vehicle to fall. There is

a risk of injuries or danger to life. Do not place

supports under the vehicle jack.

Warning

A vehicle that is raised on a vehicle jack may fall

off of the jack if lateral forces are exerted on it.

There is a risk of injury and risk of damage to

property. While the vehicle is raised, do not ex‐

ert lateral forces on the vehicle or pull abruptly

on the vehicle. Have a stuck wheel removed by

a dealer’s service center or another qualified

service center or repair shop.

Warning

The jack, issued by the vehicle manufacturer, is

provided in order to perform a wheel change in

the event of a breakdown. The jack is not de‐

signed for frequent use; for example, changing

from summer to winter tires. Using the jack fre‐

quently may cause it to become jammed or

damaged. There is a risk of injury and risk of

damage to property. Only use the jack to attach

275

Wheels and tires

MOBILITY

Securing the vehicle against

rolling

Lug bolt lock

Concept

General information

The wheel lug bolts have a special coding. The

lug bolts can only be released with the adapter

which matches the coding.

The vehicle manufacturer recommends to addi‐

tionally secure the vehicle against rolling away

when changing a wheel.

Overview

On a level surface

The adapter of the lug bolt lock is in the onboard

vehicle tool kit or in a storage compartment close

to the onboard vehicle tool kit.

Place wheel chocks or other suitable objects in

front and behind the wheel that is diagonal to the

wheel to be changed.

▷ Lug bolt, arrow 1.

▷ Adapter, arrow 2.

On a slight downhill gradient

Unscrewing

1. Attach the adapter to the lug bolt.

2. Unscrew the lug bolt.

3. Remove the adapter after unscrewing the lug

bolt.

Screwing on

1. Attach the adapter to the lug bolt. If neces‐

sary, turn the adapter until it fits on the lug

bolt.

If you need to change a wheel on a slight down‐

hill grade, place chocks and other suitable ob‐

jects, for instance a rock, under the wheels of

both the front and rear axles against the rolling

direction.

2. Screw on the lug bolt. The tightening torque

is 140 Nm.

3. Remove the adapter and stow it after screw‐

ing on the lug bolt.

Preparing the vehicle

▷ Park the vehicle on solid and non-slip ground

at a safe distance from traffic.

276

Wheels and tires

MOBILITY

▷ Switch on the hazard warning system.

▷ Set the parking brake.

Jacking up the vehicle

▷ Engage a gear or move the selector lever to

position P.

Warning

Hands and fingers can be jammed when using

the vehicle jack. There is a risk of injury. Com‐

ply with the described hand position and do not

change this position while using the vehicle

jack.

▷ As soon as permitted by the traffic flow, have

all vehicle occupants get out of the vehicle

and ensure that they remain outside the im‐

mediate area in a safe place, such as behind a

guardrail.

1. Hold the vehicle jack with one hand, arrow 1,

and grasp the vehicle jack crank or lever with

your other hand, arrow 2.

▷ Depending on the vehicle equipment, get

wheel change tools and, if necessary, the

emergency wheel from the vehicle.

▷ If necessary, set up a warning triangle or port‐

able hazard warning light at an appropriate

distance.

▷ Secure the vehicle additionally against rolling.

▷ Loosen the lug bolts a half turn.

Jacking points for the vehicle

jack

2. Insert the vehicle jack into the rectangular re‐

cess of the jacking point closest to the wheel

to be changed.

The jacking points for the vehicle jack are lo‐

cated at the indicated positions.

277

Wheels and tires

MOBILITY

3. Extend the vehicle jack by turning the vehicle

jack crank or lever clockwise.

Mounting a wheel

Mount one emergency wheel only, as required.

1. Unscrew the lug bolts.

2. Remove the wheel.

3. Put the new wheel or emergency wheel on

and screw in at least two lug bolts in a cross‐

wise pattern until hand-tight.

If non-original light-alloy wheels of the vehicle

manufacturer are mounted, the accompany‐

ing lug bolts may have to be used as well.

4. Take your hand away from the vehicle jack as

soon as the vehicle jack is under load and

continue turning the vehicle jack crank or

lever with one hand.

4. Hand-tighten the remaining lug bolts and

tighten all lug bolts well in a crosswise pat‐

tern.

5. Turn the vehicle jack crank counterclockwise

to retract the vehicle jack and lower the vehi‐

cle.

5. Make sure that the vehicle jack foot stands

vertically and at a right angle beneath the

jacking point.

6. Remove the vehicle jack and stow it securely.

After the wheel change

1. Tighten the lug bolts crosswise. The tighten‐

ing torque is 101 lbs ft/140 Nm.

2. Stow the nonworking wheel in the cargo area,

if necessary.

The nonworking wheel cannot be stored un‐

der the cargo floor panel because of its size.

3. Check tire inflation pressure at the next op‐

portunity and correct as needed.

6. Make sure that the vehicle jack foot stands

vertically and perpendicularly beneath the

jacking point after extending the vehicle jack.

4. Reinitialize the Flat Tire Monitor.

Reset the Tire Pressure Monitor TPM.

5. Check to make sure the lug bolts are tight

with a calibrated torque wrench.

6. Have the damaged tire replaced at the near‐

est dealer's service center or another quali‐

fied service center or repair shop.

Emergency wheel

7. Crank the vehicle up, until the vehicle jack is

with the entire surface on the ground and the

relevant wheel is maximum 1.2 inches/3 cm

above ground.

Concept

In the event of a flat tire, the emergency wheel

can be used in place of the wheel with the defec‐

278

Wheels and tires

MOBILITY

tive tire. The emergency wheel is only intended

for temporary use until the defective tire/wheel

has been replaced.

Removing the emergency wheel

1. Slacken the luggage strap at the clasps, ar‐

row 1.

General information

Mount one emergency wheel only.

Also check the tire inflation pressure of the

emergency wheel in the cargo area regularly, and

correct it as needed.

Safety information

2. Detach the hooks of the luggage straps at the

lashing points.

Warning

The emergency wheel has particular dimen‐

sions. When driving with an emergency wheel,

changed driving properties may occur, for in‐

stance reduced lane stability when braking, lon‐

ger braking distance, and changed self-steering

properties in the limit area. There is a risk of ac‐

cident. Drive moderately and do not exceed a

speed of 50 mph/80 km/h.

3. Remove the bag with the emergency wheel

and wheel change tools from the cargo area,

arrow 2.

4. Open the bag, remove emergency wheel and

wheel change tools.

Inserting the emergency wheel

1. Stow the emergency wheel and wheel

change tools in the bag.

Overview

2. Place the bag into the cargo area.

3. Attach the hooks of the luggage straps at the

lashing points.

4. Secure the luggage straps. Make sure that it

is correctly and firmly seated.

The emergency wheel and wheel change tools

are located in a bag in the cargo area.

279

MOBILITY -> Wheels and tires for Your BMW Z4 2 Door First Generation (2002-2008)

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