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Hi Marki,
I know quite a bit about heat cycles for tyres. For road tyres it really doesn't matter, UV and normal weathering degrades the actual rubber. For race tyres, yes the extreme heat generated during a race boils the plasticiser from the compound (which is what makes it soft), on my tyres they form a blue tinge on the outside edge of the tread. After a few heat cycles the tread starts to harden and the tyres take longer to warm up, once at operating temperature the work fine, but it is the first sign that they should be changed. I tried to get away with not changing a set of tyres for "one more meeting", combined with a cold day and a green track at Phillip Island...
Cheers
Stuart
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