1996 Cadillac DeVille Owner's Manual - Page 302

Traction -- A, B, C The traction grades, from highest lowest, are A, B to and C, and they represent the tire's ability to stop on wet pavement as measured under controlled conditions on of specified government test surfaces asphalt and concrete. A tire marked C may have poor traction performance. Warning: The traction grade assigned to this is based tire on braking (straightahead) traction tests and does not include cornering (turning) traction. Warning: The temperature grade for this tire is established for a tire thatproperly inflated and not is overloaded. Excessive speed, underinflation, or excessive loading, either separately or in combination can cause heat buildup possible tire failure. and Wheel Alignment and Tire Balance Temperature -- A, B,C The wheels on your vehicle were aligned and balance carefully at the factoryto give you the longest tire life and best overall performance. The temperature grades are (the highest),B and C, A representing the tire's resistance to the generation of heat and its ability to dissipate heat when tested under controlled conditions on a specified indoor laboratory test wheel. Sustained high temperature can cause the material of the tireto degenerate and reduce tire life, and excessive temperature can lead sudden tire failure. to The gradeC corresponds to a level performance of which all passenger car tires must meet under the Federal Motor Vehicle Safety StandardNo. 109. Grades A and B represent higher levels of performance on the laboratory test wheel than the minimum required law. by In most cases,you will not need to have your wheels aligned again. However, you notice unusual tire wear if or your vehicle pulling one or the other, the way alignment may need to reset. If you notice your be on vehicle vibrating when driving a smooth road, your wheels may need to be rebalanced. 6-41