Bmw X6 xDrive50i 2009 Bedienungsanleitung PDF herunterladen (Seite 256)

Wheels and tires

254

Tire identification marks

Knowledge of the labeling on the side of the tire

makes it easier to identify and choose the right

tires.

Tire size

Speed letter

Q = up to 100 mph/160 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

Tire Identification Number

Tires with DOT codes meet the guidelines of

the US Department of Transportation.

DOT code:

Tire age

The manufacturing date of tires is contained in

the tire coding: DOT ... 3008 indicates that the

tire was manufactured in week 30 of 2008.

BMW recommends that you replace all tires

after 6 years at most, even if some tires may last

for 10 years.

Uniform Tire Quality Grading

Quality grades can be found where applicable

on the tire sidewall between tread shoulder and

maximum section width. For example:

Tread wear 200 Traction AA

Temperature A

DOT Quality Grades

Tread wear

Traction AA A B C

Temperature A B C

All passenger car tires must conform to

Federal Safety Requirements in addition

to these grades.<

Tread wear

The tread wear 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. For example, a tire graded

150 would wear one and one-half (1γ) 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, how-

ever, and may depart significantly from the

norm due to variations in driving habits, service

practices and differences in road characteris-

tics and climate.

Traction

The traction grades, from highest to lowest,

are AA, A, B, and C.

These grades represent the tire's ability to stop

on wet pavement, as measured under con-

trolled conditions on specified government test

surfaces of asphalt and concrete. A tire marked

C may have poor traction performance.

The traction grade assigned to this tire is

based on straight-ahead braking traction

tests, and does not include acceleration, cor-

nering, hydroplaning, or peak traction charac-

teristics.<

e.g.

Nominal width in mm

Aspect ratio in Ξ

Belted construction – radial

Rim diameter in inches

Carrying capacity ID-code

(not in ZR tires)

Speed code letter

(in ZR tires before the R)

255/55 R 18 109 H

e.g.

Manufacturer code

for tire make

Tire size and tire design

Tire age

DOT xxxx xxx 0806

Online Edition for Part no. 01 41 2 600 809 - © 09/08 BMW AG

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