Not sure an IP rating alone gives you the information you need for this usecase. A [mountain] bike motor doesn't just need to resist ingress, it needs to do so

Not sure an IP rating alone gives you the information you need for this usecase. A [mountain] bike motor doesn't just need to resist ingress, it needs to do so after hundreds of hours of violent shaking while its external bearings are under heavy load. It should also tolerate a certain amount of direct impact. I can certainly imagine this being tricky to achieve for a few hundred $! > Don't people bike because they want to get fit? No. I personally ride a _non-motorized_ bike for the health benefits, but I ride a _bike_ as a means of transport. I want as many people as possible to do this, it's better for everyone if people cycle. E-bikes are a fantastic way to expand the pool of potential cyclists. "Bikes are for sporty people" is a symptom of a car-centric environment. In a healthy city, bikes are an option for everyone who has full mobility.