Get Maintenance and Technical Data -> US Department of Transportation Guide for Aston Martin Dbx SUV 2020

US Department of Transportation

Temperature

Warning: The temperature grade for this tire is

established for a tire that is properly inflated and not

overloaded. Excessive speed, underinflation, or excessive

loading, either separately or in combination, can cause heat

buildup and possible tire failure.

Uniform Tire Quality Grades

The following information relates to the tire grading system

developed by the National Highway Traffic Safety

Administration, which grades tires by tread wear, traction and

temperature performance. All passenger vehicle tires must

conform to federal safety requirements in addition to these

grades.

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 excessive temperature can lead to sudden

tire failure. The grade C corresponds to a level of performance

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.

Tread Wear

The treadwear grade is a comparative rating based on the wear

rate of the tire when tested under controlled conditions on a

specified government test course. For example, a tire graded 150

would wear one and one-half (1½) 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

Traction

Warning: The traction grade assigned to this tire is based

on straight-ahead braking traction tests and does not include

acceleration, cornering, hydroplaning, or peak traction

characteristics.

The traction grades, from highest to lowest, are AA, A, B, and C.

The grades represent the tire's ability to stop on wet pavement as

measured under controlled conditions on specified government

test surfaces of asphalt and concrete. A tire marked C may have

poor traction performance.

Maintenance and Technical Data 11.19

Information on ‘P’ Type Tires

Tire Sidewall Information

Both US and Canada Federal regulations require tire

The tire size, load index and speed rating for your vehicle may

manufacturers to place standardized information on the sidewall be different from this example.

of all tires. This information identifies and describes the

[1] P: A tire, designated by the Tire and Rim Association (T&RA),

that may be used for service on cars, SUVs, minivans and light

trucks.

fundamental characteristics of the tire and also provides a Tire

Identification Number for safety standard certification and incase

of a recall.

If your tire size does not begin with a letter this may mean it

is designated by either ETRTO (European Tire and Rim Technical

Organization) or JATMA (Japan Tire Manufacturing Association).

‘P215/65R15 95H’ is an example of a tire size, load index and

speed rating. The definitions of these items are listed below.

[2] 215: The nominal width of the tire in millimetres from side

wall edge to side wall edge. In general, the larger the number, the

wider the tire.

[3] 65: The aspect ratio which gives the tire’s ratio of height to

width.

[4] R: Shows a “radial” type tire.

[5] 15: The wheel or rim diameter in inches. If you change your

wheel size, you will have to purchase new tires to match the new

wheel diameter.

11.20 Maintenance and Technical Data

[6] TIRE IDENTIFICATION NUMBER (TIN): (Also known as

[8] H: The tire’s speed rating. The speed rating denotes the

‘DOT Code’) The Tire Identification Number (TIN) begins with speed at which a tire is designed to be driven for extended

the letters ‘DOT’ and shows that the tire meets all federal

standards. The next two numbers or letters are the plant code

periods of time under a standard condition of load and inflation

pressure. The tires on your vehicle may operate at different

designating where it was manufactured, the next two are the tire conditions for load and inflation pressure. These speed ratings

size code and the last four numbers represent the week and year may need to be adjusted for the difference in conditions. The

the tire was built. For example, the numbers 317 mean the 31st ratings range from 81-186 mph. These ratings are listed in the

week of 1997. After 2000 the numbers go to four digits. For

example, 2501 means the 25th week of 2001. The numbers in

between are identification codes used for traceability. This

information is used to contact customers if a tire defect requires

a recall.

following chart.

Letter Rating

Speed Rating

M

N

Q

R

81 mph

87 mph

[7] 95: The tire’s load index. It is an index that relates to how

much weight a tire can carry.

99 mph

106 mph

112 mph

118 mph

124 mph

130 mph

149 mph

168 mph

186 mph

You may not find this information on all tires because it is not

required by federal law.

S

T

U

H

V

W

Y

For tires with a maximum speed capability over 149 mph, tire

manufacturers sometimes use the letters ZR. For those with a

maximum speed capability over 186 mph, tire manufacturers

always use the letters ZR.

Maintenance and Technical Data 11.21

[9] TIRE TYPE:

• M+S or M/S

Mud and Snow

• AT

All Terrain

• AS

Vehicle Loading

Warning: Overloading the vehicle can negatively affect

the handling and stopping performance of the vehicle tires.

Correctly loading this vehicle will provide maximum return of

vehicle design performance. Before loading this vehicle,

familiarize yourself with the following terms for determining the

vehicle’s weight ratings from the vehicle’s Safety Compliance

Certification Label.

All Season.

[10] TIRE PLY COMPOSITION AND MATERIAL USED: Shows

the number of plies or the number of layers of rubber-coated

fabric in the tire tread and sidewall. Tire manufacturers also must

show the ply materials in the tire and the sidewall, which include

steel, nylon, polyester, and others.

[11] MAXIMUM LOAD: Shows the maximum load in kilograms

and pounds that can be carried by the tire. Refer to the Safety

Compliance Certification Label, which is located on the B-Pillar

or the edge of the driver’s door, for the correct tire pressure for

your vehicle.

[12] TREAD WEAR, TRACTION AND TEMPERATURE GRADES:

(Refer ro page 11.19).

[13] MAXIMUM PERMISSIBLE INFLATION PRESSURE: (Referro

page 11.25)

11.22 Maintenance and Technical Data

Labels for US vehicles

Labels for Canadian Vehicles

The illustrations shown are examples and may not accurately

describe the labels on this vehicle.

Maintenance and Technical Data 11.23

MFD Date: Month and Year the vehicle was manufactured (e.g. Payload: The payload is the combined weight of cargo and

08 / 16 = August 2016).

passengers that the vehicle is carrying. The maximum payload for

your vehicle can be found on the Tire Label on the edge of the

driver’s door. Look for ‘The Combined Weight of Occupants and

Cargo Should Never Exceed XXX kg OR XXX lb’ for maximum

payload. The payload listed on the Tire Label is the maximum

payload for the vehicle as built by the assembly plant. If any after

GVWR: Gross vehicle weight (curb weight + full payload).

GAWR F: Maximum load on the front axle.

GAWR R: Maximum load on the rear axle.

Seating Capacity: Shows the maximum number of passengers.

Payload: Make sure that the payload (cargo + passengers) does market or Aston Martin Dealer installed equipment has been

not exceed this limit.

installed on the vehicle, the weight of the equipment must be

subtracted from the payload listed on the Tire Label in order to

determine the new pay load.

Tire sizes: The size of tires to be used on this vehicle.

Cold inflation pressure: The maximum recommended tire

inflation pressure.

Gross Vehicle Weight: The maximum recommended weight for

a vehicle, including: the weight of the vehicle itself, fuel and

other fluids, passengers, and all cargo.

Both labels are located on the vehicle door opening edge.

11.24 Maintenance and Technical Data

Determining the Correct Load Limit

Maximum Permissible Inflation Pressure

1. Locate the statement ‘The combined weight of occupants

and cargo should never exceed XXX kg or XXX lb’ on the

vehicle’s tire label.

2. Determine the combined weight of the driver and

passengers that will be riding in the vehicle.

The maximum permissible inflation pressure is the tire

manufacturer’s maximum permissible pressure and / or the

pressure at which the maximum load can be carried by the tire.

This pressure is normally higher than the manufacturer’s

recommended cold inflation pressure which can be found on the

Safety Compliance Certification Label or Tire Label.

3. Subtract the combined weight of the driver and passengers

from XXX kg or XXX lb.

The cold inflation pressure should never be set lower than the

recommended pressure on the Safety Compliance Certification

Label or Tire Label.

4. The resulting figure equals the available amount of cargo

and luggage load capacity. For example, if the ‘XXX’ amount

equals 1250 lb and there will be four 150 lb passengers in

the vehicle, the amount of available cargo and luggage load

capacity is 650lb (1250–600 (4x150) = 650 lb).

5. Determine the combined weight of luggage and cargo being

loaded on the vehicle. That weight may not safely exceed

the available cargo and luggage load capacity calculated in

Step 4.

The recommended cold inflation tire pressures for this vehicle

can also be found in this handbook.

Maintenance and Technical Data 11.25

Safety Practices

Tire Terminology

Tire Label: A label showing the OE (Original Equipment) tire

sizes, recommended inflation pressure and the maximum weight

the vehicle can carry.

Warning: If your vehicle is stuck in snow, mud, sand, etc,

do not rapidly spin the tires; spinning the tires can tear the

tire and cause an explosion. A tire can explode in as little as

three to five seconds.

Tire Identification Number (TIN): A number on the sidewall of

each tire providing information about the tire brand and

manufacturing plant, tire size and date of manufacture. Also

referred to as DOT code.

Warning: Do not spin the wheels at over 35 mph. The

tires may fail and injure a passenger or bystander.

Driving habits have a great deal to do with your tire mileage and

safety.

Inflation Pressure: A measure of the amount of air in a tire.

Standard Load: A class of P-metric or Metric tires designed to

carry a maximum load at 35psi [37psi (2.5bar) for Metric tires].

Increasing the inflation pressure beyond this pressure will not

increase the tire’s load carrying capability.

• Observe posted speed limits.

• Avoid fast starts, stops and turns.

• Avoid potholes and objects on the road.

• Do not run over curbs or hit the tire against a curb when

parking.

Extra Load: A class of P-metric or Metric tires designed to carry a

heavier maximum load at 41psi [43psi (2.9 bar) for Metric tires].

Increasing the inflation pressure beyond this pressure will not

increase the tire’s load carrying capability.

Highway Hazards

No matter how carefully you drive there’s always the possibility

that you may eventually have a flat tire on the highway. Drive

slowly to the closest safe area out of traffic. This may further

damage the flat tire, but your safety is more important. If you feel

a sudden vibration or ride disturbance while driving, or you

suspect your tire or vehicle has been damaged, immediately

reduce your speed. Drive with caution until you can safely pull

off the road. Stop and inspect the tires for damage. If a tire is

under-inflated or damaged, deflate it, remove the wheel and

replace it with your spare tire and wheel. If you can not detect a

cause, have the vehicle towed to the nearest repair facility or tire

dealer to have the vehicle inspected.

kPa: Kilo pascal, a metric unit of air pressure.

PSI: Pounds per square inch, a standard unit of air pressure.

11.26 Maintenance and Technical Data

Electrical Systems

Cold Inflation Pressure: The tire pressure when the vehicle has

been stationary and out of direct sun light for an hour or more

and prior to the vehicle being driven for 1 mile (1.6km).

Fuses

The electrical systems are protected by fuses. If any lamps,

accessories, or controls do not function, inspect the applicable

fuse.

Recommended Inflation Pressure: The cold inflation pressure

found on the Safety Compliance Certification Label or Tire Label

(found on the edge of the driver’s door).

If a fuse has blown, the inside element will be melted. If the same

fuse blows again, avoid using that system and consult your Aston

Martin Dealer as soon as possible.

Bead Area of the Tire: Area of the tire next to the rim.

Sidewall of the Tire: Area between the bead area and the tread.

Tread Area of the Tire: Area of the perimeter of the tire that

contacts the road when mounted on the vehicle.

Rim: The metal support (wheel) for a tire or a tire and tube

assembly upon which the tire beads are seated.

Maintenance and Technical Data 11.27

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