I'm headed to the track this weekend and am taking the Lotus. My question is does anyone know the thickness of the advan ad048's? I'm at the wear bar on the backs and don't know if they are good to run or if I should toss and get another pair. Just bought a pair of Goodyear GSD3's for the back .... 15000 miles and they hit the wear bars... fronts look perfect. Sounds like the duration of the GT also. Well Jeff says 10K for the rears.