hub size

Unicycle hubs are fundamentally different from bicycle hubs (unless
we're talking about giraffe or other non-standard unicycles).

A unicycle hub (as I'm sure you are aware) has a axle that is fixed to
the hub shell. Sometimes the axle and the hub flanges are all one
piece. In other cases the axle is inserted into a hub shell and held in
place with splines or keys. The frame then attaches to bearings on the
axle such that the frame can rotate around the entire hub/axle.

A bicycle hub has a axle that is designed to rotate freely inside of the
hub shell. Generally the axle on a bicycle is bolted to the bicycle
frame and is fixed in position. The hub rides on bearings around the
axle which is secured to the frame.

In any case, you could not use an off-the-shelf bicycle hub on a
unicycle.

-mg

--
mgrant - Ever hoping for the best!

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