All passenger car tires must conform to
Federal Safety Requirements in addition
The temperature grade for this tire is
established for a tire that is properly
to these grades.<
inflated and not overloaded. Excessive speed,
underinflation, or excessive loading, either sep-
arately or in combination, can cause heat
buildup and possible tire failure.<
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.
RSC: Run-Flat Tires
Run-Flat tires are labeled on the sidewall with a
circular symbol containing the letters RSC.
Refer to page 88.
M+S
Winter and all-season tires.
These have better winter performance proper-
ties than summer tires.
Traction
Tire condition
The traction grades, from highest to lowest, are
AA, A, B and C.
Inspect your tires frequently for tread wear,
signs of damage and for foreign objects lodged
in the tread. Check the tread depth.
Those 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.
Minimum tread depth
The tread depth should not drop below 1/8 in/
3
tion only specifies a minimum tread depth of
1/16
3
hydroplaning, even when only small amounts of
water are present on the road surface.
mm, although, for example, European legisla-
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.<
in/1.6 mm. At tread depths below 1/8 in/
mm there is an increased risk of high-speed
When winter tires wear down past a tread depth
of 1/6 in/4 mm, they become perceptibly less
suitable for winter conditions. In the interest of
safety, new tires should be installed.
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
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 Vehi-
cle Safety Standard No. 109. Grades B and A
represent higher levels of performance on the
laboratory test wheel than the minimum
required by law.
Wear indicators in the base of the tread groove
are distributed around the tire's circumference;
87
Online Edition for Part no. 01 41 0 014 500 - © 08/07 BMW AG
| Categories | BMW Manuals, BMW Z-Series Manuals |
|---|---|
| Tags | BMW E86, BMW Z4 3.0i, BMW Z4 3.0si |
| Model Year | 2008 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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