I currently have all the parts to do this. I simply threaded one of those $7.50 freewheels onto a SBP crank arm, in the opposite direction. My motor will be mounted just above the BB, driving the left side crank freewheel. From there, I will run a 24 tooth sprocket on the freewheel, to anything between a 39 and 56 tooth sprocket on the rear wheel, using Recumpence's disc brake adapter. This design leaves the entire bike drivetrain as-is, and completely separates the two. (I am using a roller bearing one-way clutch for my motor sprocket. (Scooter parts)).
This seems to be the easiest and most problem free way to reduce the motor rpms. The only thing I want to improve on is getting a higher quality freewheel which won't make so much noise at 600rpms. I'm about to order one of those ACS left side freewheels, hoping they are a bit higher quality???
Is there any way to take a normal White Industries freewheel and screw it on backwards? This is where the cheap freewheel works great - it's symmetrical with nothing but threads, so it can thread on either side.
I was even thinking of putting 2 bike chain sprockets on the freewheel if possible, and using a front derailer to make it a 2 speed, with a chain tensioner dealing with the chain. That would be nearly the holy grail.... Completely independent 2 speed reduction drive, requiring no fancy machining, and keeping the weight centered, low, and the motor easily protected (possibly covered for stealthness). The thing is I need a super quiet freewheel (or, even better, just a simple bearing to hold my sprockets on the crank). Pedaling the cranks would never put torque through the left side due to the extremely lower gear compared to the bike gears.
What ya think?
Wait! What if I just remove the paws from the WI freewheel????? Then it can spin freely in either direction, acting as a simple bearing. YES! This would work, right?
This seems to be the easiest and most problem free way to reduce the motor rpms. The only thing I want to improve on is getting a higher quality freewheel which won't make so much noise at 600rpms. I'm about to order one of those ACS left side freewheels, hoping they are a bit higher quality???
Is there any way to take a normal White Industries freewheel and screw it on backwards? This is where the cheap freewheel works great - it's symmetrical with nothing but threads, so it can thread on either side.
I was even thinking of putting 2 bike chain sprockets on the freewheel if possible, and using a front derailer to make it a 2 speed, with a chain tensioner dealing with the chain. That would be nearly the holy grail.... Completely independent 2 speed reduction drive, requiring no fancy machining, and keeping the weight centered, low, and the motor easily protected (possibly covered for stealthness). The thing is I need a super quiet freewheel (or, even better, just a simple bearing to hold my sprockets on the crank). Pedaling the cranks would never put torque through the left side due to the extremely lower gear compared to the bike gears.
What ya think?
Wait! What if I just remove the paws from the WI freewheel????? Then it can spin freely in either direction, acting as a simple bearing. YES! This would work, right?
