Race Face (http://www.raceface.com/) Tru Vativ (http://www.truvativ.com/)
and other companies are making cranks with the ISIS spline design.
A web search on ISIS drive or ISIS spline will get you more info.
Unfortunately, no one is currently making an ISIS unicycle hub and cranks
specifically for unicycles.
> A few months ago someone posted a link for a design of
> the axles and cranks on bicycles. This particular design
> was being pushed as a newer, stronger, more reliable interface
> between the axle and crank arms. From what I remember, it
> used a tapered spline interface, kind of like the Profile
> Does anyone still have the link?
> Jerry Seutter