Originally Posted by
ac555
Pro chassis comes with a 16/42 gearing as well. I busted my 42 spur and put on a backup 46 spur with 18 pinion and I ran out of space on mount slider. Had to mill out a few mm to squeeze on the 18. I'm planning to run 41 or 42 spur with 18 pinion, which should work.
With stock 42 spur, I could not install a 14 pinion. So theoretically you should be able to use 16+ pinions. The RTR motor mount is different than the Pro but should fit same gearing.
You can go to kershaw designs and get a 8mm bore mod1 pinion and use it for a spur with minor modifications. I've got 34/34 on my car right now lol, just need to finish my new top plate. This thing is going to break the sound barrier next time out lol!