I saw this vintage Cannondale up in Ojai while on a club ride. Nobody around to talk to, but it looks pretty adaptable to most vintage bikes. This was about 2 years ago before e-bikes were even seen on our rides. Now some of our older club riders have them, but not as vintage bike conversions. I can't make out the logo of the mfr of the big red motor thingy. Somebody said "Copenhagen Wheel" ?

Sorry to not get a drive side picture.