1998 Chevrolet Blazer Owner's Manual - Page 314

When It's Timefor New Tires One way to tell when it's time for new tires is to check the treadwear indicators, which will appear when yourtires have only 1/16 inch (1.6 mm) or less of tread remaining. The tire has a bump, bulge or split. The tire has a puncture, cut or other damage that can't be repaired well becauseof the size or location of the damage. Buying New Tires To find out what kind and size of tires you need, look at the Certificatioflire label. 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. 0 was The tires installed on your vehicle when it new had a Tire Performance CriteriaSpecification (TPC Spec) number on each tire's sidewall. When you get new tires, get ones with that same TPC Spec number. way That your vehicle will continueto have tires that are designed to give properendurance, handling, speed rating, traction, ride and other things during normal service on your vehicle. If your tires havean all-season tread design, the TPC number will followed by an "MS" be (for mud and snow). If you ever replace yourtires with those not havinga TPC Spec number, make sure they are the samesize, load range, speed rating and construction type (bias, bias-belted or radial) as youroriginal tires. You can see cord or fabric showing through the tire's rubber. The tread or sidewall is cracked, cut or snagged deep enough to show cord or fabric. 6-44