I got this https://www.bafangusadirect.com/bafang-750w-bbs02-mid-drive-motor-and-battery-p/60.htm https://www.bafangusadirect.com/bafang-750w-bbs02-mid-drive-..

I got this https://www.bafangusadirect.com/bafang-750w-bbs02-mid-drive-motor-and-battery-p/60.htm https://www.bafangusadirect.com/bafang-750w-bbs02-mid-drive-... and it works great! I've had it for a few years now. strong enough to handle pulling both my kids in a bike trailer and also a lot faster than I was expecting for commuting back and forth to work.