R: radial tire code
All passenger car tires must conform to
Federal Safety Requirements in addition
to these grades.◀
17:
91:
rim diameter in inches
load rating, not for ZR tires
V: speed rating, before the R on ZR tires
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 (11/2) 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.
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
U.S. Department of Transportation.
Traction
DOT code:
The traction grades, from highest to lowest, are
AA, A, B, and C.
DOT xxxx xxx 0710
xxxx: manufacturer code for the tire brand
xxx: tire size and tire design
Those grades represent the tire’s ability to stop
on wet pavement as measured under controlled
conditions on specified government test surfa‐
ces of asphalt and concrete. A tire marked C may
have poor traction performance.
0710:
tire age
Tire age
The tire manufacturing date is contained in the
tire identification mark: DOT ... 0710 means that
the tire was manufactured in the week 7 of 2010.
The traction grade assigned to this tire is based
on straight-ahead braking traction tests, and
does not include acceleration, cornering, hydro‐
planing, or peak traction characteristics.
BMW recommends that you replace all tires af‐
ter 6 years at most, even if some tires may last
for 10 years.
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. Sus‐
tained high temperature can cause the material
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 B and A represent
higher levels of performance on the laboratory
test wheel than the minimum required by law.
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
193
Online Edition for Part no. 01 41 2 604 231 - 03 10 500
| Categories | BMW Manuals, BMW Z-Series Manuals |
|---|---|
| Tags | BMW E89, BMW sDrive35is, BMW Z4 sDrive35i, sDrive30i |
| Model Year | 2011 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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