You could probably go down to an 18t or a 20t pinion on the 40t spur.
I know the 22t mod 1 pinion I have will work with the 36t spur, but that's just about the limit.
Notice how much adjustment there is left in the motor mount slide?
A setup like this on a Mean lower kv inrunner would be awesome also, for you guys that are looking for tougher ways to gear up.
