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Sustained high temperatures can cause the tire material to degenerate and excessive temperatures can lead to blowouts and tread separations. The "A" rating signifies the coolest running tire.
If the vehicle and tires are maintained and operated properly, they should perform safely and reliably when run at the speed limit, even in very hot weather. "C" tires run hotter than tires graded "A" or "B", but a "C" graded tire is not "UNSAFE".
Keep in mind that under-inflation or overloading will overheat and damage any tire and greatly increase the likelihood of a blowout.
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