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.
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Traction AA, A, B, C
Reporting safety defects (USA)Adjustment
NOTE:When replacing the rear drive shaft or bearing, select the thrust needle bearing.1. Using the ST, measure the distance “A” from ST end face to rear drive shaft thrust needle bearing catch surface.ST 398643600GAUGE2. Using the ST, measure the height “B” from the interm ...