We went to Road Atlanta for the first time last weekend for the SARRC/ECR/Pro IT. We scuffed a set of Hoosiers the first practice session in preparation for the ECR race on Sunday morning. We ran a set of RA1's (we bought used) all day Saturday. That was 6 qualifying sessions and 1 SARRC race. Our best lap was 1:46.1. It rained for the ECR race, so we put on a set of (used) RA1's at ~4/32 tread. The track was still damp in spots for the Pro IT race, so we decided to save our brand new shiny Hoosiers for another day and put our well used RA1's back on. The driver thought the tires were giving up a little at the end of the race, but ran his fastest lap (1:45.5) on lap 17 of 20. The car had been a little loose and the outside radial grooves are starting to disappear from the rear tires. The two deeper center grooves still show plenty of rubber. Are these tires at the end of their useful life? I don't know how many previous heat cycles they had, but we put 7 on them this weekend. Also, any guesses as to how much the new Hoosiers would have helped our lap times?