I ran them on a 1 mile go kart track similar to an auto-x. It was very tight and they were squeeling on every turn, lol. I was putting a lot of heat into them and burned a lot of life off in just 2 15 min sessions. I will see how they do on the road course this spring. So far it seems like the stock rubber was better but we'll see. I think that track is just a tire killer.