1994 GMC Safari Owner's Manual - Page 268

When It's Time for New Tires One way to tell when it's time for new tires is to check the treadwear indicators, which will appear when your tires have only 2/32 inch ( I .6 mm) or less of tread remaining. You need a new tire i f You can see the indicators at three or more places around the tire. a You can see cord or fabric showing through the tire's rubber. a The tread or sidewall is cracked, cut or snagged deep enough to show cord or fabric. a 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 andsize of tires you need, look at the CertificatiodTire label. The tires installed on your vehicle when 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 Spec number. That way, your vehicle will continue to have tires thatare designed to give proper endurance, handling, speed rating, traction, ride and other thingsduring normal service on your vehicle.If your tires have an all-season tread design, the TPC number will be followed by a "MS" (for mud and snow). 6-50