Re: Just for fun: whats the biggest motor fitted to a bike?
If you modified the drum to lock to the crankshaft and removed the shoes, that would work much better. Drill a hole through the drum and the bushing and tap it for a set screw, then make sure the hole for the set screw is positioned over the key slot on the crankshaft, tighten down the set screw and the drum is locked to the shaft. I've considered doing this to convert to secondary belt drive and using a slip clutch. But it would also work for a friction drive roller if you're nuts enough to do those speeds, lol.