engineer this is Gator Joe here I see this post is couple weeks old so disregard if you've already made final decisions having gears running off the motor is it ok to do but it will rob the motor power and realistically it's just one more thing to break I have a nice revolution beach cruiser when flying horse motor and expansion chamber 40 sprocket with adapter so it goes around the hub not spokes.for me this **** up on a 26 inch rim beach cruiser went about 35 miles an hour the nice thing about it was I could choose it 25 or 30 without stress in the motor out with too many rpms my main advice to you please make sure you use Loctite on damn near everything and panel it to make sure your chains lined up before you go trying to start the motor double check everything all the time tighten up your nuts all the time