1997 Chevrolet S10 Pickup Owner's Manual - Page 284

Rust-ordirt on a wheel,.or on the partsto which it is fastened, can make wheelnuts bec:omelo-ose a-ftepa.time. The wheel coukd come off and cause: an accident. When you changea wheel, remove any .rust or dirt from places where the wheel attaches to the vehicle. In an emwgency, you can use a cloth or a paper: towel to do this; but be sgre to use a scraper or wim brush later, you if need to, to get all the rust dirt off. (See or "Changing a Flat Tire" in .the Index.) When,U's Time for Nk-WTires One way to tell when it's time for new tires is to check the treadwear indicators, which wil'l appear when yo-urtires have only l / 16 inch (1.6 mnm) or less of tread remaining. 10 You can see the indicators at three 01: mn1-e places around. thetire-. a You can see cord .or f'abric showing through the tire's rubber. The tread or sidewall is cracked, cut or snagged deep enou.gh to show cord-orfabric. The tire has a bump, bulge or split. The tire hn.s a puncture, cut or other damage that can't be repaired well because of the size 01: :location of the damage.