Tire Tech Tire Size Conversion Chart（轮胎技术轮胎尺寸换算表）.pdf

Tire Tech - Tire Size Conversion Chart 5/31/10 1:08 PM San Jose Classic Chevys Club Tire Tech - Tire Size Conversion Chart [SJCCC Home | Spotters Guide | Events Calendar | Cruise Night Events | Toy Drive Car Show | Links Page | Message Board | Photo Galleries | Technical Info | Newsletters] Sidewall Markings There is a lot of information on the sidewall of a tire. Typically, youll find UTQG ratings for treadwear, traction and temperature, the size of the tire, the load rating index number with a speed rating index, the construction type (bias or radial), the D.O.T. (Dept. of Transportation) compliance code, construction details, and of course, the make and model of the tire. On some tires used as original equipment, you may also find a marking that indicates its OE status. Porsche uses an N-0 or N-1 designation, BMW uses a star on some O.E. tires and General Motors uses a TPC code. Light Truck tires are sometimes marked with an LT for Light Truck before the size, passenger tires are often marked with the letter P for Passenger before the size. Passenger tires of the same size with or without the P are virtually interchangable. /clubsites/chevylist/tech/tire_size_conversion.htm Page 1 of 8 Tire Tech - Tire Size Conversion Chart 5/31/10 1:08 PM UTQG Ratings The Department of Transportation requires each manufacturer to grade its tires under the Uniform Tire Quality Grade (UTQG) labeling system and establish ratings for treadwear, traction, and temperature resistance. These tests are conducted independently by each manufacturer following government guidelines to assign values that represent a comparison between the tested tire and a control tire. While traction and