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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 Vehi‐
cle Safety Standard No. 109. Grades B and 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.◀
RSC – Run-flat tires
The symbol identifying run-flat tires is a circle
with the letters RSC on the sidewall, refer to
page 219.
M+S
Winter and all-season tires.
These have better winter properties than
summer tires.
XL
Designation for specially reinforced tires.
Tire tread
Summer tires
The tread depth should not be less than
0.12 in/3 mm, although European legislation,
for example, requires a minimum tread depth
of only 0.063 in/1.6 mm. At tread depths less
than 0.12 in/3 mm, there is a great danger of
hydroplaning even in low water depths and at
raised speeds.
Winter tires
The suitability of winter tires for winter driving
is reduced noticeably when their tread depth
becomes less than 0.16 in/4 mm.
Minimum tread depth
Wear indicators in the tread base are distrib‐
uted around the circumference of the tire and
are marked on the tire sidewall with TWI, Tread
Wear Indicator. When the tire tread has been
worn down to the wear indicators, a tread has
reached a depth of 0.063 in/1.6 mm.
Tire damage
General information
Inspect your tires often for damage, foreign ob‐
jects lodged in the tread, and tread wear.
Notes
Driving over rough or damaged road surfaces,
as well as debris, curbs and other obstacles can
cause serious damage to wheels, tires and sus‐
pension parts. This is more likely to occur with
low-profile tires, which provide less cushioning
between the wheel and the road. Be careful to
avoid road hazards and reduce your speed, es‐
Seite 216
Mobility
Wheels and tires
216
Online Edition for Part no. 01 40 2 911 452 - VI/13
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