1995 Pontiac Sunfire Owner's Manual - Page 244

Temperature A, B, C The temperature grades are A (the highest), B, and C , representing the tire's resistance to the generationof heat and its ability to dissipate heat when tested under controlled conditions on a specified indoor laboratory test wheel. Sustained high temperature can causethe material of the tire to degenerate and red-ucetire 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 grade forthis tire is established for a tire that is properly inflated and not overloaded. Excessive speed, underinflation, or excessive loading, either separately or in combination, can cause heat buildup and possible tire failure. These grades are molded on the sidewalls of passenger car tires. While the tires available as standard or optional 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. Wheel Alignment andTire Balance The wheels on your vehicle were aligned and balanced carefully at the factory to give you the longest tire life and best overall performance. In most cases, you will not need to have your wheels aligned again. However, if you notice unusual tire wear or your vehicle pulling one way or the other, the alignment may need to be reset. If you notice your vehicle vibratingwhen driving on a smooth road, your wheels may need tobe rebalanced. Wheel Replacement :... ,. p f, Replace any wheel that is bent, cracked, or badly rusted or corroded. If wheel nuts keep coming loose, the wheel, wheel bolts, and wheelnuts should be replaced. If the wheel leaks air, replace it (except some aluminum wheels, which can sometimes be repaired). See your Pontiac dealerif any of these conditions exist. Your dealer will know the kind of wheel you need. Each new wheel should havethe same load carrying capacity, diameter, width, offset, and be mounted the same way as the one itreplaces. 6-39