The uni started life as a Nimbus 1, 28.
It has the standard Nimbus 700c rim which is clearly designed for a
standard 700c x 35 tyre. I've never tried to fit anything fatter.
As for comparisons to a 20: think of the 28 as a big 24, not a small
Coker.
With long cranks (here, I'm thinking 125 or possibly 150) it is more or
less as easy to ride as a 24. When I bought it, it had 110s, and I was
able to idle it easily on a perfectly smooth gym floor.
Where you do lose out on manoeuvreability is that your weight is a bit
higher, so idling is a slower "pendulum swing", and the larger radius of
the curve of the wheel means that tight turns are a little less tight.
On a perfectly smooth surface, with the skinny tyre, it is a beautiful
feeling to ride a 28. On a rougher surface, it is an entertaining
challenge.
What I like about unicycling is that there are so few variables (wheel
size, crank length, tyre section) and you need to choose a set up
optimised for a certain type of riding. Nothing is perfect for
everything. Me being me, I tend to avoid the obvious, which is why I've
been riding cross country on a 28 (rather than a 29) and I've been known
to do long distances (20 + miles) on a 24 when I have the Coker
available. It's all good fun.
--
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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