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controlled conditions on specified govern-
ment test surfaces of asphalt and concrete.
A tire marked C may have poor traction per-
formance.
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 control-
led conditions on a specified indoor labo-
ratory test wheel. Sustained high tempera-
ture can cause the material of the tire to
degenerate and reduce tire life, and exces-
sive 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.
Warning
The temperature grade for this tire is es-
tablished for a tire that is properly inflated
and not overloaded. Excessive speed, un-
derinflation, or excessive loading, either
separately or in combination, can cause
heat buildup and possible tire failure.
Runflat tires
Runflat tires, refer to page 246, are labeled
with a circular icon containing the letters
RSC marked on the tire sidewall.
Online Edition for Part no. 01405A7D6C6 - II/23
Wheels and tires
M+S
Winter and all-season tires with better cold
weather performance than summer tires.
Tire tread
Summer tires
Do not drive with a tire tread depth of less
than 0.12 in/3 mm, otherwise there is an
increased risk of aquaplaning.
Winter tires
Do not drive with a tire tread depth of less
than 0.16 in/4 mm, as such tires are less
suitable for winter driving conditions.
All-season tires
Do not drive with a tire tread depth of less
than 0.16 in/4 mm, as such tires are less
suitable for winter driving conditions.
Minimum tread depth
Distributed over the tire circumference are
the tire manufacturer's wear indicators with
a height of at least 0.06 in/1.6 mm, which
serve as an indicator of tire tread wear.
The positions of the wear indicators are
marked on the tire sidewall with TWI, Tread
Wear Indicator.
Irrespective of the wear indicators, observe
the statutory regulations on the minimum
tread depth.
MOBILITY
243
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