1997 Chevrolet Corvette Owner's Manual - Page 280

When It's Time for New Tires One way to tell when it's time for new tires is to check thetreadwear indicators, which will appear when your tires have only 1/16 inch (1.6 mm) or less of tread remaining. The tread orsidewall is cracked, cut or snagged deep enough to show cord or fabric. 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. Buying New Tires To find out what kind and size of tires you need, look at the Tire-Loading Information label. The tires installed your vehicle when it was new had on a Tire Performance Criteria Specification (TPC Spec) number on each tire's sidewall. When you get new tires, get ones with that same TPC Spec number. That way your vehicle willcontinue to have tires that are designed to give properendurance, handling, speed rating, traction, rideand other things 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). You need a new tire if any of the following statements are true: You can see the indicators at three or more places around the tire. You can see cord or fabric showing through the tire's rubber. 6-45