1998 Pontiac Sunfire Owner's Manual - Page 288

Uniform Tire Quality Gra jing Mixing tires could cause you to lose control while driving. If you mix tires of different sizes or types (radial and bias-belted tires),the vehicle may not handle properly, and you could have a crash. Using tires of different sizes may also cause damage toyour vehicle. Besure to usethe san-,. size and type tires on all wheels. It's all right to drive with your compactspare,, though. It was developedfor use on your vehicle. ~ The following information relate: to the system developed by the United States N tional Highway Traffic Safety Administration, wl Ich grades tires by treadwear, traction and temperatu e performance. (This applies only to vehicles soh in the UnitedStates.) The grades are molded on the sidl walls of most passenger car tires, The Uniform Ire Quality Grading system does not apply to deep tre d, winter-type snow tires, space-saver or temporary u ;spare tires, tires with f nominal rim diameters of 10 to 1: inches (25 to 30 cm), or to some limited-production t n 5. i While the tires available on Gene a1 Motors passenger cars and light trucks may vary wi h respect to these grades, they must also conform tc Federal safety requirements and additional Gent :a1 Motors Tire Performance Criteria (TPC) stanc irds. I you use i s - .y t !s on your vehicle, the f aa wheel rim flanges could develop cracks after many milesof driving. A tire and/or wheel cou d fail suddenly, causing a crash. Use only radial-kly tires with the wheels onyour vehicle.