To demonstrate the rotating mass at the rim effect, take a household
broom.
Hold it so the handle is vertical. Now, with a single twist of the
wrist, start it spinning, then stop it by tightening your grip.
Easy.
Now, using the same broom, find the balance point and hold the broom
horizontally with one hand at the balance point. Now, with a single
twist of the wrist... much harder, isn't it?
Exactly the same mass, but it's further from the centre of rotation, so
it's harder to start, and harder to stop.
Ice dancers control their speed of rotation by moving their arms in and
out slightly, using the same principle.
As for idling a 29, it should be possible, but you have to be less
aggressive, and more thoughtful. Idling a 20 can be done with brute
force, and you can do it fast or slowly. On a bigger uni, you need to
work with the unicycle's natural period of oscillation. That means a
gentle prod of the pedal to start it moving, and leave plenty of time to
slow it down, or it will kick straight past you and spit you off.
Idling is moving from one position to another and back again, at exactly
the right speed.
--
Mikefule - Roland Hope School of Unicycling
And if you're really worried about looking stupid, you're already on a
unicycle
davis_e74 talking about helmets.
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