50:
aspect ratio in %
R: radial tire code
rim diameter in inches
load rating, not for 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
19:
103:
Y: speed rating, before the R on ZR tires
150
would wear one and one-half, 1 g, times as
well on the government course as a tire graded
The relative performance of tires depends
Speed letter
100.
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
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 cli‐
mate.
Traction
Tire Identification Number
DOT code: DOT xxxx xxx 3508
xxxx: manufacturer code for the tire brand
xxx: tire size and tire design
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 surfa‐
ces of asphalt and concrete. A tire marked C may
have poor traction performance.
3508:
tire age
Tires with DOT codes meet the guidelines of the
U.S. Department of Transportation.
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.
Tire age
DOT … 3508: the tire was manufactured in the
35th
week in 2008.
Temperature
Recommendation: regardless of wear, replace
tires at least every 6 years.
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 Band 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
All passenger car tires must conform to Federal
Safety Requirements in addition to these
grades.
Temperature grade for this tire
The temperature grade for this tire is es‐
tablished for a tire that is properly inflated and
not overloaded. Excessive speed, underinfla‐
226
Online Edition for Part no. 01 41 2 603 958 - 03 10 500
| Categories | BMW 7-Series Manuals, BMW Manuals |
|---|---|
| Tags | BMW Active Hybrid, BMW F01, BMW F02, BMW F03, BMW F04 |
| Model Year | 2011 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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