Good question.
I find a link here:
http://www.tux.org/~bagleyd/unicycle_factory/custom.html
In one of the pictures it shows:
"3" Mini-wheel Giraffe
"8" Mini-wheel Giraffe
"12" Mini-wheel Giraffe"
So I assume that he can custom-make them...at a price.
One of the difficulties in trying to make a unicycle from bicycle parts
is getting an adequate axle-crank system. However, if you look at very
small wheels, there's a solution: Tricycles. So pull the wheel and
cranks off a kid's tricycle and go to it. Obviously, this is going to
be a weak unicycle! But if you scroll down this page, you'll find kids
riding a mini-unicycle that may have been made this way:
http://www.unicyclingnt.com/html/kids_in_action.html
I also found this link about making one, but the guy hasn't done it
yet, either:
http://tinyurl.com/33o3b3
One possibility is to get the smallest-sized unicycle you can find,
disassemble the wheel, and then mount a smaller rim (and probably
shorter cranks) onto it. They make kid's bicycles down to 12", maybe
smaller. This might involve drilling new spoke holes in the rim and
would involve rounding up new spokes. You could possibly do the same
thing starting with a 20" giraffe and mounting a 12" or smaller wheel
on it.
--
StephenH
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