1998 Chevrolet Tracker Owner's Manual - Page 283

Temperature A, B, C The temperature grades are (the highest),B, and C, A representing the tire's resistance the generation of to heat and its ability dissipate heat when tested under to 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 gradeC corresponds to a level of performance which all passenger tires must meet car 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 this tireis for established for a tire thatproperly inflated and is not overloaded. Excessive speed, underinflation, or excessive loading, either separately in combination, or can cause heat buildup and possible tire failure. -- Scheduled wheel alignment and wheel balancing are not needed. However,if you notice unusual tire wear or your vehicle pulling one way the other, the alignment or may need to be reset. you notice your vehicle If vibrating when driving on a smooth road, your wheels may need tobe rebalanced. Wheel Replacement Replace any wheel that bent, cracked, or badly rusted is or corroded. If wheel nuts keep coming loose, wheel, the wheel bolts and wheel nuts should be replaced. If the wheel leaks air, replace (except some aluminum it wheels, which can sometimes repaired). See your be dealer if any of theseconditions exist. Your dealer will know the kind wheel you need. of Each new wheel should have the same load-carrying capacity, diameter, width, offset and be mounted the same way as the one it replaces. If you need to replace anyof your wheels, wheel bolts or wheel nuts, replace them only with new original GM Wheel Alignment and Tire Balance equipment parts. This way, you will be sure to have the The wheels on your vehicle were aligned and balanced right wheel, wheel bolts and wheel nuts your for carefully atthe factory to give you the longest tire life Chevrolet model. and best overall performance. 6-46