125s is a little long for 20". Though I used it for years, I think most
of the top riders today are using cranks in the 102 range (including
me)
I think 125 is good for Freesytle, or even 140. It depends how much
leverage you want. Shorter cranks make for smoother riding and better
spins, but less leverage. Longer cranks make the "power" tricks easier,
such as side ride, unispins, and some one-footed stuff.
I would start with 125 and take it from there, as 125 is also a decent
size for cruising, and the legal size for racing (if you care).
--
johnfoss - The wilder Wilder
John Foss, the Uni-Cyclone
"jfoss" at "unicycling.com" -- www.unicycling.com
"Read the rules!" -- 'IUF Rulebook'
(http://www.unicycling.org/iuf/rulebook/) -- 'USA Rulebook'
(http://www.unicycling.org/usa/competition/)
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