A typical outrunner, I’m pretty sure including the one u mention, only has bearings supporting the rotor on one side. People have done friction drives like that on boards and I guess bikes but maybe find a motor with bearings that support on both sides. Actually I think that might be the rare motor that does have support on both sides
Actually it makes for a very stealthy build and a great little booster for an avid biker. I have all the big motors. These little Hooby King outrunnes are cool. 63mm 260kv