The bike I just finished is the rhino bike but this one has a child's 12.5 inch rear wheel as a drive wheel. I welded a #25 sprocket to the wheel, but I could have put a bike sprocket on the motor as well. I expect that a bike sprocket would have worked a little better speed wise. I'll do a picture later.

new motor

I have a 600 watt motor I am now using on a twenty inch bike with a 24" suspension fork in front. Also has a larger chain ring to give me the ability to help the motor some. I need to run lots of tests on it but it seems fine so far