1994 Chevrolet S10 Pickup Owner's Manual - Page 274

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.) Treadwear The treadwear grade is a comparative rating based on the wearof the rate tire when tested under controlled conditions on a specified government test course. For example, a tire graded would wear one and a half 150 (1-1/2) times as well on the government course as a tire graded The relative 100. performance of tires depends upon the actual conditions their use, of however, and may depart significantly from the norm due to variations in driving habits, service practices and differences in road characteristics and climate. Tractlon - A, 9, C The traction grades, from highest to lowest A, B, and C . They represent are: the tire's abilityto stop on wet pavement as measured under controlled conditions on specified government test surfaces of asphalt and concrete.A tire marked C may have poor traction performance. Warning: The traction grade assigned to this tire is based on braking (straight-ahead) traction tests and does not include cornering (turning) traction. 6-56