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283
uuChecking and Maintaining TiresuDOT Tire Quality Grading (U.S. Vehicles)
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 wheel than the
minimum required by law.
■
Traction
■
Temperature
1Traction
Warning: 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.
1Temperature
Warning: The temperature grade for this tire is
established for a tire that is properly inflated and
not overloaded. Excessive speed, underinflation,
or excessive loading, either separately or in
combination, can cause heat buildup and
possible tire failure.
13 CIVIC HYBRID-31TR26100.book 283 ページ ２０１２年１２月１８日 火曜日 午後２時５９分
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