@mmdolbow @davepolaschek @skyfaller something like the https://hilltopper.com in a 700C wheel would cruise at 16-17mph, if you have a bike with suitable fork for that retrofit. That's a pretty limited setup with the small battery won't do 28 or haul much weight uphill without help, but might get you there without sweat if you cruise at 15mph (I'm running a 20in on my #supercargo -- works well enough that I just keep riding it instead of trying to finish that build how I imagined with 2 motors)