It's true that heat cycling can cause a tire to cure and harden, causing a loss of grip. However this is mostly limited to R-comps. Most street tires, and I'm talking 140 treadwear and up, are able to hold up to nearly infinite heat cycles and are just as fast new as they are on the cords.
That being said I have noticed a lose of grip as my stockers wear but I'm attributing that more to it being much colder then when I had them new.
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2013 SCCA Solo National Champion
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