1995 GMC Jimmy Owner's Manual - Page 284

When It's Time for New Tires Tread Wear Indicators 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 1/16 inch (1.6 mm) or lessof tread remaining. You need a new tire if You can see the indicators at three or more places around thetire. You can seecord or fabric showing through the tire's rubber. 0 The tread or sidewall 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 of tires you need, look at the size 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 that are designed give proper to endurance, handling, speed rating, traction, ride and 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). a If you ever replace your tires with those not having TPC Spec number, make sure they are thesame size, load range, speed rating and construction type (bias, bias-belted or radial) as youroriginal tires. 6-44