Sorry, this sounds like the flying car.....something of a novelty but completely useless. They tout less unsprung weight and then add 31 lbs to each wheel! All the moving parts and failure points make me cringe. A simple bearing is much simpler and is not prone to failure from dust, rocks, ice, snow, etc... How fast do those little idler wheels turn??? Holy crap. 4 watts my foot. Friction is proportional to rpm in a rotating assembly. I will happily stick with a central spindle and bearing.
