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I did one airfield day on 17" Toyo T1-Rs. Six sessions of fifteen minutes or so. Granted they were probably under inflated. Granted I was sliding it a fair amount but I reckon they would only be good for one more day after swapping front to rear. Personally I am investing in a spare set of rims and trackday tyres as at least then I can rag them to within an inch of their lives and drive home legally.