1998 Chevrolet Lumina Owner's Manual - Page 281

Uniform Tire Quality Grading Mixing tires could cause to lose control while you driving. If you mix tires of different sizesor 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 to your vehicle. Be to use the same sure size and type tires on all wheels. It's all right to drive with your compact spare, though. It was developedfor use on your vehicle. The following information relates to system the developed bythe United States National Highway Traffic Safety Administration, which grades tires by treadwear, traction and temperature performance. (This applies only to vehicles sold the United in States.) The grades are molded on the sidewalls most of passenger car tires. Uniform Tire Quality Grading The system does not apply deep tread, winter-type snow to tires, space-saveror temporary use spare tires, tires with nominal rim diametersof 10 to 12 inches (25 to30 cm), or to some limited-production tires. While the tires available on General Motors passenger cars and light trucks may vary with respect to these grades, they must also conform to Federal safety requirements and additional General Motors Tire Performance Criteria (TPC) standards. If you use bias-plytires on your vehicle, the wheel rim flanges could develop cracks after many miles of driving. tire and/or wheel could A fail suddenly, causing a crash. only radial-ply Use tires with the wheels on your vehicle. 6-43