polyurethane gets soft when it gets hotter. little hub motors get hot. what happened to the manta drive or whatever they were calling it with grooves I wonder or maybe that was another company.
do those motors fit on regular skate hangers or is the hanger unique with aluminum lathed back some? wondering how big a motor it is. There’s no magic and every hub motor is using the same type of radial magnetic interface of a standard outrunner and size will largely determine heat and power. hub motors have a greater load on them since they have no gearing, obviously, and they need to be bigger to perform as well as a geared drive.
I’d love to see a real exploded view. it would reveal the power and mechanical strength.