1995 Chevrolet Lumina Owner's Manual - Page 238

Temperature A, B, C - The temperature grades are A (the highest),B, and C , representing the tire's resistance to the generation of heat andits ability to dissipate heat when tested under controlled conditionson a specified indoor laboratory test wheel. Sustained high temperature can cause the material of the tire to degenerate and reduce tire life, excessive temperature can lead to sudden tire failure. Wheel Alignment and Tire Balance The grade C corresponds to a level performance of The wheels on your vehicle were aligned and balanced which all passengercar tires must meet under the carefully atthe factory to give you the longest tire life Federal Motor Vehicle Safety Standard 109. Grades No. and best overall performance. B and A represent higher levels of performance on the laboratory test wheel than the minimum required by law.In most cases, you will not need to have your wheels aligned again. However, if you notice unusual wear tire Warning: The temperature grade this tire is for or your vehicle pulling one way the other, the or established for a tire that properly inflated and not is alignment may need to be reset. If you notice your overloaded, Excessive speed, underinflation, or vehicle vibrating when driving on a smooth road, your excessive loading,either separately or in combination, wheels may need to be rebalanced. can cause heat buildup and possible tire failure. These grades are molded on sidewalls of passenger the car tires. While the tires available as standardoptional or equipment on General Motors vehicles may vary with respect to these grades, all such tires meet General Motors performance standards and have been approved for use on General Motors vehicles. All passenger type (P Metric) tires must conform to Federal safety requirements in addition to these grades. and 6-40