Old 03-09-09, 08:58 AM
electronic wizard
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Join Date: Feb 2009
Location: wayne
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Bikes: schwinn traveler III

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I made my own electric bike conversion, I used a 3 inch grindstone mounted on an arbor shaft, mounted that to the front fork and directly drove the knobby tire with it. that gave me like 3:26 ratio to the motor. Top speed at 12.6vdc 15 mph, at about 1600rpm on the motor. If you go with a smaller drive like 2inch then the rpm will have to go up to increase the speed mph. And distance you can travel on a charge won't change no matter what, just the speed changes with the ratio of drive. I don't know if a cordless drill motor will get up to 1600 rpm.

I didn't have a controller. That's full speed on the motor only control was on or off. I had to pedal up to speed because it sux the power at low speed. And a momentary on off switch on the handle bars.

I found that 3 inch diameter drive is the best for a 26inch mountain tire.

Bottom line is a drill will only get 500RPM way to slow to drive the wheel, top speed would be like 5 MPH. you'd have to run a sprocket setup to the crank

Last edited by raypsi; 03-09-09 at 09:19 AM.
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