1998 Pontiac Grand Prix Owner's Manual - Page 325

Scheduled wheel alignment and wheel balancing are Temperature A, B, C or not needed. However, if you notice unusual tire wear The temperature gradesare A (the highest), B, and Cy your vehicle pulling way or the other, the alignment one representing the tire's resistance the generationof to may need to be reset. you notice your If vehicle heat andits ability to dissipate heat when tested under vibrating when driving a smooth road, your wheels on controlled conditionson a specified indoor laboratory may need to be rebalanced. test wheel. Sustained high temperature can cause the material of the tireto degenerate and reduce tire life, and Wheel Replacement excessive temperaturecan lead to sudden tire failure. Replace any wheel that bent, cracked, or badly rusted is The grade C corresponds to a level performance of or corroded. If wheel nuts keep coming loose, the wheel, which all passenger car tires must meet under the wheel bolts and wheel nuts should be replaced. If the Federal Motor Vehicle Safety Standard 109. Grades No. wheel leaksair,replace it (except some aluminum B and A represent higher levels of performance on the wheels, which can sometimes be repaired). your See laboratory test wheel than the minimum required by law. dealer if any of these conditions exist. Warning: The temperature grade this tire is for Your dealer will know the kind wheel you need. of established for a tire that properly inflated and not is overloaded. Excessive speed, underinflation, or Each new wheel should have the same load-canying excessive loading, either separately in combination, or capacity, diameter, width, offset be mounted the and can cause heat buildup and possible tire failure. same way asthe one it replaces. If you need to replace any of your wheels, wheel bolts Wheel Alignment and Tire Balance or wheel nuts, replace them only with GM original new The wheels on your vehicle were aligned and balanced equipment parts.This way, you willbe sure to have carefully at the factory give you the longest tire to life for the right wheel, wheel bolts and wheel nuts your and best overall performance. Pontiac model. -- 6-50