Hoosier R3S03's Traction rating of C and temperture rating of A. They are ZR tires with max load of 1477lbs ea. at 44 max psi. I run them on 14psi. They are very soft, so soft infact I'm scaping little rocks out of them all the time. I only use them on the track only ( all four ), and that's it. No road time at all, that is why i had to even buy the stock rims over again, just so I had a set to race only. They heat up very well, but have yet to taken them to a preped track and really run them. Now I'm working on the tanny problem ( lost 2nd gear on speed shifting ).