1993 Buick Roadmaster Owner's Manual - Page 277

The tire hasa puncture, cut, or other damage that can't be repaired well because the size or location of of the damage. A CAUTION: Mixing tires could cause you to control lose while driving.If you mix tiresof different sz i or types (radial and bias-belted tires), the .To find out what kind and size tires you need; look at of vehicle may not handle properly, and you cows the Tire-Loading Information label. have a crash. Be sure to use the same size and The tires installed on your vehicle when itnew had was type tireson all four wheels. a Tire Performance Criteria Specification (TPC Spec) -number on each tire's sidewall. When you get new tires, It's all right to drive with your compact spare (if you have one).It was developed for use on your get ones with that same TPC Spec number. way, That ' :le. to are your vehicle will continue have tires that designed Buying New Tires I I to give proper endurance, handling, speed rating, traction, ride and other things during normal service on your vehicle.If your tires have an all-season tread followed. a "MS" by design, theTPC nu-mber will be 't (for mad 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) your original tires. as Uniform Tire Quality Grading The following information relates the system to developed by the United States National Highway by Traffic Safety Administration which grades tires treadwear, traction and temperature performance. (This applies only to vehicles sold the United States.) in Treadwear The treadwear grade a comparative rating based on is the wearrate of the tirewhen tested under controlled conditions on a specifiedgovement test course. For