I dunno, results may vary but I know I'm getting dozens of runs out of single sets of my usgt spec tires. In fact my tires I bought last year are faster than new sets from this year that aren't broken in yet. My only issue is that the break in period takes a good 6-10 runs before they are 'grippy' tires on asphalt so the first day of practice with these are kind of a waste when you go to bigger 3 day races with handout tires. Just my $.03...