http://www.ebay.com/itm/24V350W-DC-brush-gear-motor-MY1016Z3-/152613846770? I'm just wondering about it= I probably won't be doing anything with it- I have hub motors. I'm thinking though it would be good mounted inside the frame like a China Girl 2 cycle. I believe by the specs in the blueprint that the lower mounting bracket is drilled to exactly fit the motor clamps of a China Girl-so strapping it to an older cruiser or diamond touring frame would be easy- running another chain down the left side. I queried the vendor who said the polarity can be reversed- so my main question is- How much peddling resistance do you think it has? You could set it up with a rag joint and thinner sprocket- it has a sprock for 410 one speed bike chain, but would there be much pedal resistance? What it truly needs is a hub and left threaded free wheel, to spin freely and only kick in the motor when it's engaged. I'm also unfamiliar with the speed and power of such a set-up and it might take experimentation to find the right size sprock on the back. I know they sell kits with side mounting brackets for this kind of thing, but I detest hanging weight off center. Probably put the battery/batteries on a rear rack, but a bottle might also be possible under a top tube. The big advantage is that it's still 24 volts and so you could use a couple of scooter batteries at about 8-10 pounds for both, or even a 24v lithium ion is still much cheaper than higher voltage. Probably weigh much less than a China Girl- (no tank no exhaust, smaller motor lighter chain) and while it wouldn't perform like one- I'm getting old at 63, and no motor noise or fumes would be great too. I have NO experience at this yet- I'm just steps away from having a 36 volt hub setup on the road, but stalled out , and have a lot to do the rest of summer. Yet I got an older Black and Decker 24 volt cordless mower early this summer for $10 and though I haven't replaced the batteries yet, I tested it with two car batts wired in series, and was amazed that the little 24 v motor really screamed. Seems like it could do a lot on a light bike. I only need 15 -20 mph and about six miles of charge to get me where I most go on the china girl builds. 8-9 pounds of lead acid scooter batteries is under $50 compared to 4 lbs litium ion 36 volts at $200 or more So basically - do you think it has much pedal resistance if I just used a rag sprocket that rolled continually, or would that damage the motor? Here's another one at 250 watts- thinner lighter than the one up above. http://www.ebay.com/itm/24V250W-DC-...a1aebe3&pid=100005&rk=5&rkt=6&sd=152613846770 This one is 102 millimeters wide - not counting shaft and sprock and about 5 pounds in weight. I think most cranks would clear but not sure of the other which is wider and heavier.