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I've heard 5 years is the age you wanna scrap tires and get some new ones
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I'd agree. My 6-year-old Sport Pilots are definitely losing grip, as evidenced by the increasing number of unintentional burn-outs and the back end trying to pass me under hard acceleration.
I also agree with the long posting about the more sticky tires having a shorter shelf life - I've got a set of Hoosier R3S03s (I think thats the number) that are about 4 years old and worthless - Last time on the track with the old R3's on the rear and a set of brand-new R4's on the front, and, I swear a new set of street tires would have had better grip than those old R3's on the rear. The R4's stuck like glue, but that didn't help very much with the back and trying to swing out on every turn.