I run on a medium to high bite indoor clay track. I'm running the Ty Tessman Gunsmoke setup, with a few changes. I don't have the "C" rear shock tower, and I use sway bars to keep the car feeling the same as the traction comes up. First two rounds no sway bars, third round copper sway bars front and back, black sway bar front (thickest) and copper rear for the mains. I run the stock chassis, and the thickest front bar helped the car from dumping over the front, and doing three wheel motion into the corners. I will eventually get the schelle carbon fiber +4mm chassis, as it is supposed to help with the three wheeling too. I run a 6.5 and off the top of my head I think I run a 24t pinion. The motor comes off at 140ish, a little hotter if I push really hard. I was gonna run a 5.5, but started with a 6.5 as thats what I had, and I wanted to see how our new track would be. I don't feel I'm losing anything to the guys running 5.5s, but our track isn't that big.