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Playing with ideas

Baconator101

Active Member
Joined
Apr 2, 2017
Messages
254
I've playing around with some ideas in my head about putting an electric motor powering the front wheel. I know there's kits but that's too easy and too $$$. First it helps to see the motor that piqued my brain. Here it is. https://www.ebay.com/itm/172134478559

Now that you've seen it here was the rough idea. That motor is small and also has mounting holes on it. Was thinking of making a bracket that would hold it straight up and down attached to the fork, with the 90 degree shaft on the bottom, facing the spokes. Either on the front or behind the fork. Then putting a sprocket on that shaft which would power a drive sprocket on the front wheel... That's my rough idea anyway. I don't know much about gear ratios besides trial and error, nor if even that motor would work. Haven't gotten to power, wiring and control but to me that seems like the easy part. I was thinking of maybe a one way sprocket on the motor for when it is not in use or coasting. Any who thats it for this post, I have more ideas aswell but who has the time?
 
Last edited:


Steve Best

Well-Known Member
Joined
Sep 22, 2012
Messages
1,265
That is only 21w. You really need at least 250w (about 1/4hp) to power a bike.
I have a similar, but more powerful, motor on this bike:
 

Baconator101

Active Member
Joined
Apr 2, 2017
Messages
254
That is only 21w. You really need at least 250w (about 1/4hp) to power a bike.
I have a similar, but more powerful, motor on this bike:
Ok I figured it would be weak. Just wasn't sure how weak. Nice folding bike, what are the specs of the motor you used? And also ride time, power source, and speed? Just to give me an idea. Thanks
 

Steve Best

Well-Known Member
Joined
Sep 22, 2012
Messages
1,265
Ok I figured it would be weak. Just wasn't sure how weak. Nice folding bike, what are the specs of the motor you used? And also ride time, power source, and speed? Just to give me an idea. Thanks
The motor came on the well used bike, without a controller or batteries.
I used 3 Walmart LiPo4 booster batteries (36v) and a simple switch power supply to get about 20-25mph and 10-20 mile range.
LiPo batteries don't like to be fully discharged, so I tend to only use intermittent power and recharge often, so no exact specs.
Acceleration and hillclimbing is ample, since it uses the 7 speed chain drive.
 
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