1995 Pontiac Grand Prix Owner's Manual - Page 263

Buying New Tires To find out what kind and of tires you need, look at size the Tire-Loading Information label. The tires installed on your vehicle whenwas new had it a Tire PerformanceCriteria Specification (TPC Spec) number on each tire'ssidewall. When you get new tires, get ones with that same TPC Spec number. That way, your vehicle will continue have tires thatare designed to to give proper endurance, handling, speed rating, traction, ride and other things during normal service on your vehicle. your tires have an all-season tread If design, the TPC number will be followed by an"MS" (for mud and snow). a If you ever replace your tires with those not having TPC Spec number, make sure theyare the same size, load range, speed rating and construction type (bias, bias-belted or radial) as your original tires. 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 onlyto vehicles sold in the United States.) 6-50