1993 Pontiac Bonneville Owner's Manual - Page 255

Service & Appearance Care Warning: The temperature grade for this tire is established for a tire that is The traction grades, from highest to The temperature grades are A (the properly inflated and not overloaded. lowest are: A, B, and C. They represent highest), B, and C, representing the the tire's ability tostop on wet pavement tire's resistance tothe generation of heat Excessive speed, underinflation, or excessive loading, either separately in or as measured under controlled conditions and its abilityto dissipate heat when combination, can cause heat buildup on specified government test surfaces of tested under controlled conditions on a and possible tire failure. specified indoor laboratory test wheel. asphalt and concrete. A tire marked C Sustained high temperature can cause may have poor traction performance. Those grades are moldedon the the material of the tire to degenerate and sidewalls of passenger car tires. Warning: The traction grade assigned to this tire is based on braking (straight- reduce tire life, and excessive While the tires available as standard or temperature can lead tosudden tire ahead) traction tests and does not optional equipment on General Motors failure. The grade C corresponds to a include cornering (turning) traction. vehicles may vary with respect to these level of performance which all grades, all such tires meet General passenger car tires must meetunder the Motors performance standards have and Federal Motor Vehicle Safety Standard been approved for useon General No. 109. Grades B and A represent Motors vehicles. All passenger type higher levels of performance on the (P Metric) tires must conform to Federal laboratory test wheel than the minimum safety requirements in addition to these required by law. grades. 254 Traction-A, 5, C Temperature-A, B, C