Tread wear - This grade gives a comparative rating based on the wear rate of a tire when tested under carefully controlled conditions. For example, a tire graded at 200 should have its useful tread twice as long as a tire graded at 100. Obviously, tire life (in miles) varies depending on actual driving conditions. Variation in driving habits, service applications, attention to proper maintenance (rotation, wheel alignment, maintaining air pressure), and road conditions all contribute to tread wear.

Traction - Traction grades represent the tire's ability to stop on wet pavement as measured under controlled conditions on asphalt and concrete. The traction grades from highest to lowest are: "AA," "A," "B," and "C." A tire graded "AA" may have relatively better traction performance than a tire graded "A," "B," or "C," based on straight-ahead braking tests. The grades do not reflect cornering or turning traction performance of the tires.

Temperature Resistance - This grade reflects the tire's resistance to heat as well as its ability to dissipate heat. Sustained high temperatures can cause decreased tire life or sudden tire failure. The grades from highest to lowest are: "A," "B," and "C." "C" grade represents the absolute minimum requirements by federal standards. This grading is based on proper inflation of the tire, proper mounting on the rim, and the assumption that the tire's load is within its capacity. Excessive speed, under inflation, and overloading (separately or in combination) can cause excessive heat buildup and possible tire failure.