Yeah...I am running 1/8 scale Serpent type foams thanks to Wolfpack Radicals wheel adaptors. They are pretty close to the outer wheel diameter of the 2.2 wheels and slicks. As for as gearing, I am stuck at 20 due to the limited space I was working with to start with.
CF Ofna GTP II Extended Chassis Castle/Flux 2200kv 6s
CF Ofna DM-1 Pro CC1717
CF Sportswerks Mayhem ST
CF Losi LST2