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uuChecking and Maintaining TiresuDOT Tire Quality Grading (U.S. Vehicles)
278
Maintenance
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 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 Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of performance on the laboratory test
test wheel than the minimum required by law.
■
Traction
■
Temperature
1Traction
Warning: The traction grade asssigned to
this tire is based on straight-ahead braking
traction tests, and does not include
acceleration, cornering, hydroplaning, or
peak traction characteristics.
1Temperature
Warning: The temperature grade fo r this tire
is established for a tire that is properly inflated
and not overloaded. Excessive speed, under-
inflation, or excessive loading, either
eparately or in combination, can cause heat
buildup and possible tire failure.
CIVIC 2D-31TS8600.book 278 ページ ２０１１年３月７日 月曜日 午後１時１０分
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