I have the version 2 X-MAXX running two 6700 4s Lipos from Traxxas. I have the Hobbywing Max 6. I wanted to use gearing that came with the truck to get 50mph the 18/46 but I want to use it off road with out over heating issues at all. So I was thinking maybe if I ran 18/50 maybe I can hit 45mph which seems plenty fast anybody running this setup with any issues what so ever.