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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
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 B and A represent higher levels
of performance on the laboratory test wheel than the minimum re
quired by law.
S
warming
is properly inflated and not overloaded.
underinflation, or excessive loading, either separately or in com
bination, can cause heat buildup and possible tire failure.
k .
indoor
laboratory
The tire temperature grade is established for a tire that
test
wheel.
Sustained
high
Excessive speed,
1 0 3
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