Originally Posted by
omenwolf
Castle motors have a 1/8 shaft so to use mod 1 pinions with 5mm bore you will need a reducer. ofna and robinson racing make them. ofna also makes mod1 1/8 bore up to 16t.
I just read that and I bet this is something that My LHS wont stock. Also since the pinion itself is a lot smaller I am assuming that I will have to change out the spur gear also?