You might want to consider a KH setup. Have you read this?:
Second, the KH/Onza hub:
Profile hubs have an effective, simple design that works OK, and they
are pioneers in that they were the first mainstream manufacturer to make
good splined unicycle hubs. But....they can be improved in several ways:
1) Profile splines are strong but prone to creaking due to manufacturing
variations and wear and tear. The KH/Onza axle has a tapered section on
each end, with a split washer that expands to compress the crank against
the axle. Like all systems this requires maintenance (greasing) of the
splines, but is an effective solution.
2) As Roger said, flange design makes a big difference for rim strength.
The KH/Onza hub has a much better shape than any other uni hub for rim
stiffness and strength, and for minimizing stress on the spokes.
High-grade (7000 series) aluminum is much, much better for supporting
spokes than steel flanges, such as those on D.M. or Koxx hubs. That is
the big disadvantage of welding steel flanges to a steel hub.
3) The hub-axle connection KH/Onza is totally new for unicycle hubs and
by far the best available. Profiles (and also the 2004 KH hub), used a
keyway slot, which is weaker and prone to loosening and manufacturer
defects. Each 7000 series Aluminum flange on the KH/Onza is machined
separately and attached to the axle with the same splines as the cranks.
This is way stronger and much lighter because it removes material from
the centre of the hub (the centre of the KH/Onza hub is hollow except
for the axle).
Third, the cranks:
There will always be debates forever on the advantages/disadvantages of
Aluminum versus Cromoly cranks. Aluminum is a lighter metal but the
cranks aren't necessarily lighter because the cranks are typically solid
(except for hollowtech bike cranks), whereas Cromoly cranks are hollow
(KH/Onza and Koxx crank arms are the same weight).
Aluminum is stiff but may be prone to snapping, whereas CrMo typically
bends before it breaks- a good safety factor. CrMo may also be more
durable to extended hard impacts, like we have on unicycles. Koxx cranks
are smooth on the outside but also have no Q-factor (outwards flare), so
they are actually more prone to hitting your ankle bone than the 2005
KH/Onza cranks. The shortest Profiles are 145mm. In my opinion this is
too long for trials. 140mm is better for rolling hops, you are less
likely to hit your pedals on the ground, and they are less likely to
throw off your balance when pedalling along narrow beams.
Hopefully this info answers some of the questions out there.
Cheers,
Kris
--
pdc - Unicycling Lord of Lookout Mountain
"What doesn't kill you strengthens you, what kills you strengthens your
mother"
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