Old 02-28-09, 05:50 AM
Join Date: Feb 2009
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Well, the divide by 12, multiply by 12 rule you give, I guess, would only be valid for a certain size wheel....and my mountain bikes are 26 in. not 24. Are you referencing this to a 24 in. wheel? Also, the torque needed is going to be dependent on size/weight of the rider. Is that 20 ft-lbs figure sufficient for say a 200 lb rider assuming the motor is going to accelerate bike from a stop? Once I know what the max torque needed is, then I can figure out what the max amps required is, and build a controller of the appropriate rating. Motor hub conversion kits are expensive. I can mount a motor on a plate that rotates to drive the front wheel (I have rear racks/panniers on back wheel) and power with drill batteries like Dewalt for less, I think.
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