The Nimbus X Frame is a Freestyle frame, it definately cannot fit a
Trials (2.5inch) Tyre.
The Nimbus II Frame can fit a Trials tyre.
The Nimbus X has a completely flat crown, and a slimmer profile crown.
It's also available in a selection of Neck Lengths. The flat crown is
great for stand up tricks, as is the longer neck (Gets that seatpost
clamp out of the way). The longer neck also allows you to have the
strong frame right up to the seat, rather than having a super long
seatpost.
The Nimbus II frame crown is, for want of a better description, "Upside
Down V With Legs and a Neck" - It is kinda funky for standing on, and I
don't think you can buy it with a long neck. It's a more versatile
frame, though.
Pictures:
'Nimbus II' (http://www.unicycle.com/shopping/shopexd.asp?id=834)
'Nimbus X Long Neck'
(http://www.unicycle.com/shopping/shopexd.asp?id=849)
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Matt.Weston
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