Whe el s and tire s, Tire labeling – Mercedes-Benz CLA-Class 2014 Owners Manual User Manual

Page 332

Tire size designation, load-bearing

capacity and speed rating

Tire width

;

Nominal aspect ratio in %

Tire code

Rim diameter

Load bearing index

Speed rating

Tire data is vehicle-specific and may devi-

ate from the data in the example.

General: depending on the manufacturer's

standards, the size imprinted in the tire wall

may not contain any letters or may contain

one letter that precedes the size description.
If there is no letter preceding the size descrip-

tion (as shown above): these are passenger

vehicle tires according to European manufac-

turing standards.
If "P" precedes the size description: these are

passenger vehicle tires according to U.S.

manufacturing standards.
If "LT" precedes the size description: these

are light truck tires according to U.S. manu-

facturing standards.
If "T" precedes the size description: these are

compact emergency spare wheels at high tire

pressure, to be used only temporarily in an

emergency.
Tire width: tire width : shows the nominal

tire width in millimeters.
Nominal aspect ratio: aspect ratio ; is the

size ratio between the tire height and the tire

width and is shown in percent. The aspect

ratio is calculated by dividing the tire width by

the tire height.
Tire code: tire code = specifies the tire type.

"R" represents radial tires; "D" represents

diagonal tires; "B" represents diagonal radial

tires.
Optionally, tires with a maximum speed of

over 149mph (240km/h) may have "ZR" in

the size description, depending on the man-

ufacturer (e.g. 245/40 ZR 18).
Rim diameter: rim diameter ? is the diam-

eter of the bead seat, not the diameter of the

rim flange. The rim diameter is specified in

inches (in).
Load bearing index: load bearing index A is

a numerical code which specifies the maxi-

mum load-bearing capacity of a tire.
Do not overload the tires by exceeding the

specified load limit. The maximum permissi-

ble load can be found on the vehicle's Tire and

Loading Information placard on the B-pillar on

the driver's side (

page 324).

Example:
A load-bearing index of 91 indicates a maxi-

mum load of 1,356lb (615kg) that can be car-

ried by the tires. For further information on

the maximum tire load in kilograms and

pounds, see (

page 327).

For further information on the load-bearing

index, see Load index (

page 332).

Speed rating: speed rating B specifies the

approved maximum speed of the tire.

WARNING

Exceeding the stated tire load-bearing capa-

city and the approved maximum speed could

lead to tire damage or the tire bursting. There

is a risk of accident.
Therefore, only use tire types and sizes

approved for your vehicle model. Observe the

tire load rating and speed rating required for

your vehicle.

Regardless of the speed rating, always

observe the speed limits. Drive carefully and

330

Tire labeling

Whe

and

tire