hay Rexasso, im running the rcm chassis with 1/10 truck tires so im running 1k rear,5k center,3k front .It seems to do well against other minis on the track but less well against 1/10 4wd buggies.some of the fast guys out on the left coast are just running 1k in the crt.5, My truck turns well in but tends to straighten along the center line with too much tip in throttle so it can be hard to drive smoothly and i find i have to jently let it square up before i add to much gas ,good luck and have fun!