kylerlaird
1 W
I made a tiny bike for my daughter who refuses to learn to ride. (Don't get me started.) She has amazingly strong legs, as demonstrated on her fat-tire trike, but I pulled the pedals off of this bike. My goal was to make an electric version of her Strider, which is way too small now. I want to keep it simple for her.
This bike is run by a 60V Dewalt battery and Flipsky 75100. The thumb throttle is a speed control. It only goes up to a brisk walk. I ride it up and down the hill here at the house. It maintains the speed remarkably well with me on it. I've even taken it for a ride through the woods. It can barely make it up one of the hills.
This is a fairly large motor on a small wheel. I'm pumping way too much current through it. Torque is marginal.
I have been working toward "digital drive" for other bikes so this has been an interesting experiment for me. It's hard for me to imagine these direct drive motors ever being sufficient for solely powering a bike. Gearing is the obvious answer. Geared motors tend to be low-powered, though.
My dream motor:

This bike is run by a 60V Dewalt battery and Flipsky 75100. The thumb throttle is a speed control. It only goes up to a brisk walk. I ride it up and down the hill here at the house. It maintains the speed remarkably well with me on it. I've even taken it for a ride through the woods. It can barely make it up one of the hills.
This is a fairly large motor on a small wheel. I'm pumping way too much current through it. Torque is marginal.
I have been working toward "digital drive" for other bikes so this has been an interesting experiment for me. It's hard for me to imagine these direct drive motors ever being sufficient for solely powering a bike. Gearing is the obvious answer. Geared motors tend to be low-powered, though.
My dream motor:
- loads of torque - sufficient to pull an adult up a steep hill with 27" wheels, >100Nm?
- medium speed - top out at 15-20 MPH
- clutchless
- 10mm round axle/side cable exit/decent torque arm system
