Hey wait...are you saying that I'm scared to lean...??? HUH HUH...well your right. :-D All jokes aside, I didn't get new tires, and my rear is not round. I didn't realize HOW bad it was till I got out on a "smooth" track. I could feel the bike "tip" as it would go from the flat part, to the round part, it felt like the rear was sliding. At first it scared me, but once I realized what was going on I dealt with it. I would never again go to a track day with tires like I had.especially when they aren't perfetly round anymore, which I suspect to be the case with yours.