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679 8-1. Specifications 8 Vehi ■ Temperature A, B, C The temperature grades are A (the highest), B, and C, representing 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. car tires must meet under the Federal Motor Vehicle Safety Stan- dard No. 109. ratory test wheel than the minimum required by law. inflated and not overloaded. Excessive speed, underinflation, or excessive loading, either sepa- rately or in combination, can cause heat buildup and possible tire failure. |