Join Date: Oct 2008
Location: Moncton, NB, Canada
What are you performance requirements ? *( rider weight, area/terrain, desired speed on level ground ) .. battery voltage etc.. and budget ?
I have a couple Crystalyte 4 series front axle motors and some side covers with freewheel threads, the front axle is 100mm, the side cover and a couple washers would make a 125mm easily enough... these are no longer made.. but have a reputation for being the most silent motor available.
Otherwise, most rear motors are 135mm so you would have to strech the frame a bit, i realize it's aluminum but most frames will flex enough for this without too much trouble ( done it lots )