since the whole esk8 thing started, almost everyone is using a longboard with motors of 50 or 63 diameter.
but the real question here is, a nearby project i am thinking of building an electric skateboard (not the longboard). so 50mm wheels or smaller. a normal standard skateboard.
it should not be fast, it should be easy to carry, lightweight and it should move me.
so mechanics and stuff is not the problem, but i am concerned about the motors - so here is the question.
how can i find out which is the smallest possible motorsize i can use? sure the gear ratio also plays a role but this i can change. so 30 in dia? 35? outrunner?
i think 15-20km/h is the perfect and comfortable speed to move for citys and stuff.