In Reply To:
was the "black hole" that had no front axle. I think it was deamed "illegal" so disappeared quickly. Sorry I don't have a picture reference. I'll bet some of the bicycling types here know about it though.
Jim O'Brien has one on the wall in his shop at the Right Gear in Concord, NC: it has no axle, and it has a hole just behind where the axle would be...the rim rode on a series of rollers...he said it worked, but was VERY noisy and cost about 10,000.00 each to make the few that were made. Freaky!
Quid quid latine dictum sit altum videtur
(That which is said in Latin sounds profound)