2010 Lexus SC 430 Owners Manual - Page 351

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6-1. Specifications

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Temperature A, B, C

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.

Warning: The temperature grades for this tire are established for a tire that

is properly inflated and not overloaded.

Excessive speed, under inflation, or excessive loading, either separately or

in combination, can cause heat buildup and possible tire failure.