I saw a dynohub system with the light mounted on the skewer. It was really cool since the wiring stayed with the wheel. Otherwise, it has the disadvantage of casting a shadow. I have a fork crown mounted Supernova, and the shadow of the wheel still confuses me when I'm not paying attention. I keep semi-consciously thinking it's a shadow from my helmet. And then I realize it's my wheel and there really is no UFO tracking me from 100 feet up.