[QUOTE="Monkey"] My BT010s have done about 1000 miles since I got them. Trouble is, about 200 of those have been on track days, and the edges are looking somewhat the worse for wear - very chewed-up, and with loads of chewing-gum like blobs where the rubber's got a tad warm. Question is, once I've put a few road miles in and smoothed the edges down a bit, should I be worried about the state of the tyre? i.e. will the high heat have damaged the underlying structure, leaving me with less grip and more prone to blow-outs? I don't really want to change them, as there's plenty of tread left, but I've got another track day at the end of the month at Silverstone, which I'm led to believe is a pretty quick circuit.[/QUOTE] Hope not, my Corsas have done 4000 including 2 trackdays and I've another in Oct.