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If you often drive at highway speeds for periods of an hour or more, there is less chance a cooler running "A" graded tire will overheat than a "B" or "C" graded tire. All tires should perform safely and reliably when driven at the speed limit, but higher graded tires will give you a greater margin of safety. Your individual driving habits and the amount of time you spend driving in hot climates or at highway speeds should determine how much emphasis you put on the temperature resistance grade.
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