| The treadwear grade is a comparative rating based on the wear rate of the tire when tested under controlled conditions on a specified government test course. The higher the number the higher the mileage. A rating of 400 should deliver 40,000 miles under ideal conditions. |
The traction grades, from highest to lowest are AA, A, B, and C. These grades represent the tire’s ability to stop on wet pavement as measured under controlled conditions on specified government test surfaces of asphalt and concrete. |
The temperature grades, from highest to lowest are A, B, and C. These grades represent the tire’s resistance to the generation of heat and its ability to dissipate heat when tested under controlled conditions on a specified indoor laboratory test wheel. Sustained high temperature can cause the material of the tire to degenerate and reduce tire life, and excessive temperature can lead to sudden tire failure. |
