gearing
i got a 78 and a 84 spurr in 64 dp (the machined ones not the molded ones) and most gears up to 40 teeth so it shouldnt be a problem aslong as you use long spur gears.
you can flip the layshaft around and use short gears however.
both of mine have 15's in them right now as i use the corally BMS sysyems in both, i do have a kinetic/ballistic set but dont want to use them unless i cant get 17.5's from Corally (and they do sell them)
seems they run 21.5's and 17.5's here so gues i will have to make a few changes or order motors.
Krijn