1997 Pontiac Trans Sport Owner's Manual - Page 370

Traction -- A, B, C The traction grades, from highest to lowest, A, B, are and C , and they represent tire's ability to stop the on wet pavement as measured under controlled conditions on specified government test surfaces of asphalt and concrete. A tire markedC may have poor traction performance. Warning: The traction grade assigned this tireis based to on braking (straightahead) traction tests and does not include cornering (turning) traction. Temperature Warning: The temperature grade for this tire is established for a tire that properly inflated and not is overloaded. Excessive speed, underinflation, or or excessive loading, either separately in combination, can cause heat buildup possible tire failure. and Wheel Alignment and Tire Balance The wheels on your vehicle were aligned and balanced carefully atthe factory to give you the longest tire life and best overall performance. are Scheduled wheel alignment and wheel balancing not needed. However, you notice unusual tire wear if or your vehicle pulling way or the other, the one alignment may need to reset. If you notice your be vehicle vibrating when driving on a smooth road, -- A, B, C The temperature gradesare A (the highest),B, and C, representing the tire's resistance to the generation of heat and its ability dissipate heat when tested under to controlled conditionson 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 alevel of performance which all passenger tires must meet car under the Federal Motor Vehicle Safety Standard No. 109. GradesB and A represent higher levels of performance on the laboratorytest wheel thanthe minimum required by law. your wheels may need be rebalanced. to 6-45