Bmw 650i Convertible 2010 Bedienungsanleitung PDF herunterladen (Seite 200)

Wheels and tires

198

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

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 tire's date of manufacture is indicated on

the sidewall:

DOT … 1009 means that the tire was manufac-

tured in week 10 of 2009.

BMW recommends replacing all tires at least

every 6 years, 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 govern-

ment 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 varia-

tions in driving habits, service practices and dif-

ferences in road characteristics 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 controlled

conditions on specified government test sur-

faces 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.<

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

For instance

Nominal width in mm

Aspect ratio in Ξ

Radial belt construction

Rim diameter in inches

Load rating

(not on ZR tires)

Speed code letter

(in front of the R on ZR tires)

245/45 R 18 96 W

For instance

Manufacturer code

for tire make

Tire size and tire design

Tire age

DOT xxxx xxx 1009

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