I used to run TT92's on my TZR pit bike. They handled 26/27bhp easily, and that's probably the only bike I never crashed.
Since then, I've run Sava MC0, and PMT-S Slicks on my bikes. The PMT slicks I like the grip, but I end up cooking them very quickly, and then they're no good.
The MC0 always suited me better. But then, I'm not the lightest of riders on the track. Haha!