1996 Pontiac Bonneville Owner's Manual - Page 291
1996 Pontiac Bonneville Manual
Page 291 highlights
While the tires available General Motors passenger on cars and light 'trucks may vary with respect to these grades, they must also conform to Federal safety requirements and additional General Motors Tire Perforrnance Criteria (TPC) standards. . Warning: The traction grade assigned to this is based tire on braking (straightahead) traction tests does not and include cornering (turning) traction. Temperature A, B, C I - Treadwear The treadwear gradeis a comparative rating based on the wear rate of the tire when tested under controlled conditions ona 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 100. The relative performance tires depends of upon the actual conditions their use, however, and of may depart significantly from the norm due variations to in driving habits, service practices and differences in road characteristics and climate. Traction A, B, C The traction grades, from highest to lowest, areB, A, and C, and they represent thetire's ability to stop on wet pavement as measured under controlid conditions on specified government test surfaces of asphalt and concrete. .,. A tire'marked C may have poor traction performance. The temperature grades are (the highest),B, and C , A representing the tire's resistance to ,the generation of heat and its ability to dissipate heat when tested under controlled conditions on specified indoor laboratory a test wheel. Sustained high temperature can cause the material of the tire to degenerate and reduce tire life, andaxcessive temperature can lead to sudden tire - ..? .~. I . .-I failure. The grade corresponds to a level of C performance which all passenger car tires must meet under the Federal Motor Vehicle Safety Standard No. 109. Grades B and A represent higher levels of performance on the laboratory testwheel than the minimum required by law. Warning: The temperature grade for this tire is established €or a tire that is properly inflated not and overloaded.Excessivespeed,underinflation,or excessive loading, either separately in combination, or can cause heat buildup possible tire failure. and . ' ..., . 1 . I -. .. .- ..., , . ::; ,? - , r - '.: .r. .-. ..';;Y, i ... '.. .. ~ v ;,, , *. -.; :-,- =.: .%$ ;., =,,,-, YY 1. . 6-46