Back in the 70s, Al Hemminger and a machinist friend built a unicycle
with 13/16" wheel. That's supposed to be slightly smaller than a dime. I
rode this unicycle on a TV show once. It was a giraffe, about 15" high
or so, with a normal Schwinn seat on top. It had a belt drive, which
also worked as the tire on the little bottom wheel. It was very hard to
ride because the "forks" or whatever you want to call them, had very
little ground clearance. It could only be ridden on very hard, smooth
surfaces like a tile floor or formica. I believe it was listed in
Guinness in the mid 1980s, but then not listed after that (in US
editions).
Much more difficult to manage is a "standard" unicycle with tiny wheel.
In other words, pedals directly on the wheel. I've seen people ride
wheels down to about 1.5", and I know there are smaller ones out there.
At one time Peter Rosendahl had the record with a tiny-wheeled cycle
with a very low seat (about 8" high). That one may still be current.
--
johnfoss - Walkin' on the edge
John Foss, the Uni-Cyclone
"jfoss" at "unicycling.com" -- www.unicycling.com
"It's good to find something that makes boys into men and men into boys,
my opinion is that unicycling fits the bill." -- Lloyd Johnson
"Read the rules!" -- 'IUF Rulebook'
(http://www.unicycling.org/iuf/rulebook/) -- 'USA Rulebook'
(http://www.unicycling.org/usa/competition/)
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