Thought you guys would like to see what my son in law did with one of those swingarms. He added pinch bolts and a derailer tab to the dropouts.
He is running 22s lipo with a Lyen 12 fet. 18s2p in the triangle and 4s2p on the rear rack that powers a HS3548 motor (12 wires x 5 turns). 17" motorcycle rims with a 2.75" tire.
Items still to be added are better forks and rear suspension shock and 140mm cranks. He is not done with the battery enclosure either, just needs to make it pretty.
No idea of the top speed yet, but on it's first run with a battery that was 5v low, it hit 40mph in a city block and still was pulling strong. The longer swingarm really helps control wheelies.
Dave is stroked. Check out his EV grin.