DOT Tire Quality Grading (U.S. Cars)
Temperature — A, B, C
The temperature grades are A (the highest), B, and C, representing the
tire's resistance to the generation ofheat and its ability to dissipate heat
when tested under controlled conditions on a specified indoor
laboratory test wheel. Sustained high temperature can cause the materialof 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. Warning: The temperature grade for
this tire is established for a tire that
is properly inflated and not over-
loaded. Excessive speed, underinfla- tion, or excessive loading, either separately or in combination, can
cause heat buildup and possible tire
failure.
Technical Information
