I have PR2's on it right now with about 1000 miles on them, but, the back has a plug in it. It has never lost a pound of pressure since I put the plug in 700 miles ago but would they make me get a new tire/should I get a new tire for the track? I dont imagine being a beginner I will be putting much more stress on the tire than I do on the street but, I may just be leaning a bit more, so is it a big deal?