I know that 911 cup tyres are soft compound slicks for short races. These are only optimum for about an hour of running (in total, not solid time). After which they start to blister and the shoulders rub off. This drops about a second off of a brands hatch indy time! and at £1200 a set slicks can get quite expensive. The other tyres i have run are dunlop slicks for 24 hour racing. these really put up well to the abuse but we still didn't double stint them much. At hour and a half of running at most they did pretty well. ended up going through 72 tyres lol. But i guess the main point here is that as soon as slicks go past their limit of heat cycles etc the performance really drops off compared to an e marked semi slick
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