Bmw 550i xDrive Sedan 2014 User Manual download pdf (Page 219)

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

Tire Identification Number

DOT code: DOT xxxx xxx 0814

xxxx: manufacturer code for the tire brand

xxx: tire size and tire design

0814: tire age

Tires with DOT codes meet the guidelines of

the U.S. Department of Transportation.

Tire age

DOT … 0814: the tire was manufactured in the

8th week of 2014.

Recommendation

Regardless of wear, replace tires at least every

6 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: Treadwear 200; Traction AA;

Temperature A

DOT Quality Grades

Treadwear

Traction AA A B C

Temperature A B C

All passenger car 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. For example, 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 signifi‐

cantly from the norm due to variations in driv‐

ing habits, service practices and differences in

road characteristics and climate.

Traction

The traction grades, 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 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, cornering,

hydroplaning, or peak traction characteristics.

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 ma‐

terial 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

Vehicle Safety Standard No. 109. Grades Band

A represent higher levels of performance on

the laboratory test wheel than the minimum re‐

quired by law.

Seite 219

Wheels and tires Mobility

219

Online Edition for Part no. 01 40 2 928 000 - II/14

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