The first prototypes worked, in a fashion. The boots did roll freely inside the large hub-less wheels but you had to be a circus performer in order to skate with them. The "skates" were wildly unbalanced. It was like having a unicycle strapped to each foot, so they decided to put a small wheel in the back of each skate for balance.
The improvement worked but the small, rear balance wheels were absorbing most of the skater's weight while the big hub-less front wheels rolled freely along. They then took the small balance wheels off the back and put them on the front.
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