1997 Buick Regal Owner's Manual - Page 319

The tread or sidewall is cracked, cut or snagged deep enough to show cord or fabric. 0 If you ever replace your tires with those not having a TPC Spec number, make sure they are the same size, load range, speed rating and construction type (bias, bias-belted or radial) as your original tires. The tire has a bump, bulge or split. The tire has a puncture, cut or other damage that can't be repaired well because of the size or location of the damage. A CAUTION: Mixing tires c!!!uldcause you to lose control while driving. If you mix tires of different sizes or types (radial andbias-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 sure to use the same size and type tires on all wheels. It's all right to drive with your compact spare, though. It was developed for use on your vehicle. Buying New Tires To find out what kind and size of tires you need, look at the Tire-Loading Information label. The tires installed on your vehiclewhen it was new had a Tire Performance Criteria Specification (TPC Spec) number on each tire's sidewall. When you get new tires, get ones with that same TPC Specnumber. That way your vehicle will continue to have tires that are designed to give proper endurance,handling, speed rating, traction, ride and otherthings during normal service on your vehicle. If your tires have an all-season tread design, the TPC number will be followed by an "MS" (for mud and snow). 6-43