Tire identification marks
BMW recommends that you replace all tires
after 6 years at most, even if some tires may last
for 10 years.
Knowledge of the labeling on the side of the tire
makes it easier to identify and choose the right
tires.
Uniform Tire Quality Grading
Quality grades can be found where applicable
on the tire sidewall between tread shoulder and
maximum section width.
Tire size
e.g.
235/50 R 18 97 V
For example:
Nominal width in mm
Tread wear 200 Traction AA
Temperature A
Cross-sectional
relationship in Ξ
Radial tire code
DOT Quality Grades
Rim diameter in inches
Tread wear
Load rating,
not for ZR tires
Traction AA A B C
Temperature A B C
Speed rating, before R on ZR tires
All passenger car tires must conform to
Federal Safety Requirements in addition
to these grades.<
Speed code letter
Q = up to 105 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
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.
Tire Identification Number
Tires with DOT codes meet the guidelines of
the U.S. Department of Transportation.
DOT code:
e.g.
DOT xxxx xxx 3005
Manufacturer code
for tire make
Traction
The traction grades, from highest to lowest, are
AA, A, B, and C.
Tire size and tire design
Tire age
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.
Tire age
The tire's date of manufacture is indicated on
the sidewall:
DOT ... 2806 indicates that a tire was manufac-
tured in week 28 of the year 2006.
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.<
93
Online Edition for Part no. 01 41 0 013 638 - © 03/07 BMW AG
| Categories | BMW Manuals, BMW X3 Manuals |
|---|---|
| Tags | BMW E83, BMW X3 3.0i, BMW X3 3.0si |
| Model Year | 2007 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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