2008 BMW X3 Owner's Manual - Page 98

2008 BMW X3 Manual

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Wheels and tires Tire identification marks Knowledge of the labeling on the side of the tire makes it easier to identify and choose the right tires. 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 Tire size e.g. Nominal width in mm Cross-sectional relationship in Ξ Radial tire code Rim diameter in inches Load rating, not for ZR tires Speed rating, before R on ZR tires 235/50 R 18 97 V 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.< 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 government 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, however, and may depart significantly from the norm due to variations in driving habits, service practices, and differences 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. Manufacturer code for tire make Tire size and tire design Tire age DOT xxxx xxx 3005 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 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.< Tire age The tire's date of manufacture is indicated on the sidewall: DOT ...2806 indicates that a tire was manufactured in week 28 of the year 2006. 96 Online Edition for Part no. 01 41 0 014 250 - © 08/07 BMW AG

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Wheels and tires
96
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 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
Tire Identification Number
Tires with DOT codes meet the guidelines of
the U.S. Department of Transportation.
DOT code:
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.
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 (1
γ
) 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.
<
e.g.
235/50 R 18 97 V
Nominal width in mm
Cross-sectional
relationship in
Ξ
Radial tire code
Rim diameter in inches
Load rating,
not for ZR tires
Speed rating, before R on ZR tires
e.g.
DOT xxxx xxx 3005
Manufacturer code
for tire make
Tire size and tire design
Tire age