I guess I'm just gonna have to try it to see what the difference is in real time. I think it might be easier to mount the engine if I use the 20" wheel on the bike. I hope that I can work it out so I can vary the size of the friction drive wheels to increase or decrease the speed. I was able to do that no problem on the electric ones. I hope I can use the same method of attaching the friction wheels to the centrifugal clutch

It would give me a lot of fork from the seat to the wheel to play with. Also keep the engine down low for better bike balance and stability. I notice on the china girl bike that the cross winds are very destabilizing. I expect with a high mounted friction drive they would be even worse.

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