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BMW 335i xDrive Sedan 2014 User Manual

Page 192

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Tires with DOT codes meet the guidelines of
the U.S. Department of Transportation.

Tire age

DOT … 0814: the tire was manufactured in the
8th week of 2014.

Recommendation

Regardless of wear, replace tires at least every
6 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: 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 Fed‐
eral Safety Requirements in addition to these
grades.

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, 1 g,
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 signifi‐
cantly from the norm due to variations in driv‐
ing habits, service practices and differences in
road characteristics and climate.

Traction

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 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.

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.
Sustained high temperature can cause the ma‐
terial 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 re‐
quired by law.

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‐
tion, or excessive loading, either separately or
in combination, can cause heat buildup and
possible tire failure.
If necessary, have the vehicle towed.◀

RSC – Run-flat tires

Run-flat tires, refer to page

195

, are labeled

with a circular symbol containing the letters
RSC marked on the sidewall.

M+S

Winter and all-season tires with better cold
weather performance than summer tires.

Seite 192

Mobility

Wheels and tires

192

Online Edition for Part no. 01 40 2 925 743 - II/14