Page 250 of 324 pages for Buick RIVIERA 1993 Owner Manual.
[1 NZ} times as well on the government course as a tire graded 1m. The relative performance of tires depends upon the actual conditions of their use, however. and may depart signiﬁcantly from the norm due to variations in driving habits. service practices and differences in road characteristics and climate.
Traction - A, B. C
The traction grades, from highest to lowest are: A, B, and C. They represent the lire's abilityf to stop on wet pavement as measured under controlled conditions on speciﬁed government tcst surfaces ol'asphalt and concrete. A. tire marked C mayr 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.
Temperature - A, B, C
The temperature grades are A [the highest), 3, and C. mprnsenting the tire's resistance to the generation of heat and its ability to dissipate heat when tested under otintrolled conditions on a speciﬁed indoor laboratory test wheel. Sustained high temperature can cause the material of the tire to degenerate and reduce Lire lite. and excessive temperature can lead to sudden tire failure.
The grade C corresponds to a level of performance which all passenger car tires must meet under the Federal Motor Vehicle Safety Standard No. 109. Grades E and A represent higher levels of perfomance on the laboratory test wheel than the minimum required by law.
Warning: The temperature grade for this tire is established for a tire that is properly inﬂated and not overloaded. Excessive speed, nnderinilatiun, or excessive loading. Either separately or in combination. can cause heat buildup and possible tire failure.
Those grades are molded on the sidewalls of passenger car tires.
While the tines available as standard or optional equipment on General Motors vehicles may vary with respect to these grades, all such tires meet General Motors performance standards and have been approved for use on General Motors vehicles. A11 passenger type (P' Metric} tires must conform to Federal safety requirements in addition to these grades.