1995 Cadillac Seville Owner's Manual - Page 317

When it Timefor New Tires 3 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 less of tread remaining. You need a new tire i f You can see the indicators at three or more places around thetire. You can see cord or fabric showing through the tire's rubber. a The tread orsidewall is cracked, cut or snagged deep enough to show cord or fabric. 6-46