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I can't go as fast as when they were new. Is that because they have gone through many heat cycles and they don't get as sticky?
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Yes. Less tread depth can mean a faster tire, but only if the rubber is new
(this is why they shave new tires for the track). Old tires (lots of heat in them) are harder than new tires and the hardness more than offsets the lack of tread depth = less traction.
Larry
code5coupe
