1993 Pontiac Bonneville Owner's Manual - Page 253

Service & Appearance Care Buying New Tires Tire Inspection and Rotation (CONT) 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 (1.6 mm) or less of tread remaining. You need a new tire if You can see the indicators at three places around the tire. 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. The tire has a bump, bulgeor 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. st or dirt on a wheel, or on tne parts to which it is stened, can make the wheel nuts "dome loose after a time. The wheel could come off and cause an - cident . When you change a wheel, remove any rust or dirt from places where the wheel attaches to the vehicle. In an emergency, you can use a cloth or a paper towel to do this; but be sure to use a scraper or wire brush '-kr, if you need to, to get all the st or dirt off. See the Index ,Adder changing a Flat Ere... r ...252 I To find out what kind and size of tires you need, look at the Tire-Loading Information 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 sameTPC Spec number. That way, your vehicle will continue to have tires that are designed to give proper endurance, 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 followe by a "MS" (for mud and snow). 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.