8xl is the best bet, I run 24t pinion, and range from 68t spurs to 54t depending on desired speed. I run a set of 2s2p 6k lipo's (4s) with my mamba max controller w/ castle BEC. I will note I never really get this opened up to full top speed on this video either. But you can wheelie the entire length of the road if you want..
