I assume the thing bike shops use to hang bikes by the seat posts are called vices. I think I remember reading that unicycles should not be put in them. If not, why? And also, uh oh, because the bike shop just put mine in one.
I think the ones *made for bikes* are called workstands. A vice will tend to crush your tubing. A bicycle workstand will be made to hold the bike by the tubing without crushing it.
-- johnfoss - The wilder Wilder
John Foss, the Uni-Cyclone "jfoss" at "unicycling.com" -- www.unicycling.com
i'vew only seen the work stands that grib by the seat post. you should be fine. seatposts are fairly sturdy, that's why they get clamped and not other tubes.