1994 Chevrolet Blazer Owner's Manual - Page 283

Temperature - A, B, C The temperature grades are A (the highest), B, and C, representing the tire's resistance to thegeneration of heat and its ability todissipate heat when tested under controlled conditions on a specified indoor laboratory test wheel. Sustained high temperature can causethe material of the tire todegenerate and reduce tire life, and excessive temperature can lead to sudden tire failure. car The grade C corresponds to a level of performance which all passenger tires must meet under the Federal Motor Vehicle Safety Standard 109. No. Grades B and A represent higher levelsof performance on the laboratory test wheel than the minimum required by law. Warning: The temperature grade for tire is established fora tire that is this properly inflated and not overloaded. Excessive speed,underinflation, or excessive loading,either separately orin combination, can cause heat buildup and possible tire failure. These grades are molded on the sidewallsof passenger car tires. While thetires available as standard or optional equipment on General Motors vehicles may vary with respect to these grades, all such tires meet General Motors performance standardsand 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 and Tire 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 vibrating when driving on a smooth road, your wheels may need to be rebalanced. Wheel Replacement Replace any wheel that is bent, cracked orbadly rusted. If wheel nuts keep coming loose, the wheel, wheel bolts, and wheel nuts should be replaced. If the wheel leaks air, replace it (except some aluminumwheels, which can sometimes be repaired). Seeyour GM dealer if any of these conditions exist. Your dealer will know the kind of wheel you need. Each new wheel should have the same load carrying capacity, diameter, width, offset, and be mounted the same way as the one it replaces. 6-47