1994 Pontiac Grand Am Owner's Manual - Page 202

0 0 0 The tread or sidewall is cracked, cut If you ever replace your tires with those or snagged deep enough to show cord not having a TPC Spec number, make or fabric. sure they are the same size, load range, speed'rating and construction type (bias, The tire has a bump, bulge or split. bias-belted or radial) as your original tires. The tire has a puncture, cut, or other damage that can'tbe repaired well because of the size or location of the damage. Uniform Tire Quality Grading The following information relates to the system developed by the United States National Highway Traffic Safety Administration which grades tires by treadwear, traction and temperature performance. (This applies only to vehicles sold in the United States.) Buying New Tires To find out what kind and size tires you of need, look at the Tire-Loading Information label. I'readwear The treadwear grade is a comparative eating based on the wear rate of the tire when tested under controlled conditions The tires installed on your vehicle when it )n a specified government test course. For was new had a Tire PerformanceCriteria :xample, a tire graded 150 would wear Specification (TPC Spec) number on each me and a half (1 1/2) times as well on the tire's sidewall. Whenyou get new tires, ;overnment course as a tire graded 100. get ones with that sameTPC Spec rhe relative performance of tires depends It's all right to drive with your compact number. That way, your vehicle will upon the actual conditions of their use, continue to have tires that are designed to spare, though. It was developed for use on however, and may depart significantly your vehicle. give proper endurance, handling, speed from the norm due to variations in driving rating, traction, ride and other things habits, service practices and differences in during normal service on your vehicle. If road characteristics and climate. your tires have an all-season tread design, the TPC number will be followed by a "MS" (for mud and snow).