The difference between 20" and 24" is pretty minor if you have good
instructions to help you learn to ride. More important is to consider
what you think you'll do once you can stay on. 20" is better for
tricks, or riding in smaller spaces while 24" is better for cruising
around, and still can be used for tricks.
I was helping two teenaged boys learning to ride the other day. They
had their own 20" Torker, which needed a longer seatpost before it
would be appropriate for them, so I pulled out my own 20" and 24" unis
from the car. They were both tall enough to fit my unicycles almost
perfectly, and they fought over the 24" (I made them take turns). In
the end though, it should be more about riding than learning.
--
johnfoss
John Foss
"jfoss" at "unicycling.com" -- www.unicycling.com
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"pretty much every trail that we've done on the California or Moab Muni
weekends is an XC trail." -- Kris Holm, on XC from a North Shore point
of view
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