KH / Schlumpf Geared 24" mountain unicycling

tholub;1138694 wrote:
If you build the wheel well, the 29er wheel/rim should be fine for MUni
use unless you're doing huge drops. (If unicycle.com builds the wheel,
be sure to put significantly more tension into it before you do anything
serious with it).



Thank you for the advice tholub...But it is not really the answer I
wanted to receive...

My question is:

Will I be limited in strength if I change the hub of a 29er KH by the
geared one?
Or will it be fine knowing that on a huge drops the 29er rim will broke
before the geared hub (even with enough tension in the spokes)?

It could also be a security as it is definitely more suitable to broke
a 29" wheel than a hub @ 950euros


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I think you're asking if a well-built 29" wheel from a KH29 would be
weak enough to fail on a smaller drop than would break a geared hub in a
unicycle with an infinitely strong wheel... As in, -if I do a gigantic
drop on my 29er, will the wheel break before the hub, and, as it deforms
due to its breakage, cushion the hub and prevent the hub from breaking
as well?-

I believe that the answer is no; I think it is definitely possible to
build a wheel strong enough that you'd be able to use it to break your
hub during a drop. That said, just be nice to it, and you shouldn't
break your hub. Kris Holm tested the hub for two years doing drops of up
to 2 meters (6.2ish feet!) without breaking it. Now, Kris has really
good technique, so a sloppy 1-meter jump to flat ground might be as hard
on the hub as one of Kris Holm's 2-meter drops to a slanted roll-out, so
you'd have to keep that in mind as you decide how much punishment to
give it, but I'd say if you kept the drops sane and tried to do good
rollouts (i.e. not dropping to a flat, static "THUD"), you wouldn't
break your hub in a 29er. After all, it's designed for that kind of
stuff!

I think the hub is rated up to 1.5 meter drops, but I'm assuming that
that figure is for people who know what they're doing when they drop.
When I drop, I can't or don't control my landings, and, I break things,
pure and simple, If I ever put my hub in a mountain uni, I'll definitely
keep the drops under a meter. But who does drops that big on a 29er
anyway? I'm sure some of us do, but a 29er is much more of a
cross-country unicycle; big drops aren't as common. So... if you got a
hub and put it in a KH29, and proceeded to use the hell out of it, while
keeping in mind that large, sloppy drops might not be good for it, I
think you'd be just fine.


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chuckaeronut;1139097 wrote:
But who does drops that big on a 29er anyway?



Hehe. I think that Boulou has been inspired by one of our local South
African riders, who busted the rim on his K1 26inch trackmonster on the
(first ever) South African Municycling Weekend last weekend. this guy
was taking his 29er off some insane drops (1.5metres?). Well, maybe not
insane by many other unicyclists standareds, but the biggest stuff we've
seen locally.


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critter;1138737 wrote:
Didn't think of that. Because you're going fast on a smaller wheel? Like
a short board vs a long board on a wave?

Hi Corbin, Did you get a sense of this?

Still.....gunis are cool in all sizes.



The smaller wheel does feel a little more shaky. I'm going to drop a
speedo on it soon so I can compare my sspeeds to what I do on an
ungeared coker.


Corbin (in Honduras with limited access)


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critter;1138737 wrote:
Didn't think of that. Because you're going fast on a smaller wheel? Like
a short board vs a long board on a wave?




Well, there may be something to that - you are *lower down* on a geared
24" than a coker, for one thing, so it is going to take you less time to
hit the floor, period. Also I think the play in the gearing is
inherently going to reduce your balance *slightly* - the question tho is
how much, and I think the answer is "not much", as the geared 29 was
fine.

However, the 24" I had used a Sun Rhyno Lite rim, and a Schwalbe Table
Top SL tyre - I can't confirm these figures, but manufacturer's quoted
weights are 425g for the former (i.e. quite a light rim), and 560g for
the latter (an insanely, stupidly light tyre) - and I certainly can
confirm it didn't weigh much (!). As such, it was responsive and
manoeuverable as hell, but equally unstable - not much momentum to
preserve it's speed over bumps, and whenever anything did happen to
throw you off (including simple lapses of concentration), it did so
*very quickly indeed* and largely without warning. Hence I didn't really
dare push my maximum speed too much....i.e. not beyond what I could run
out of!

(ISTR one longish ride, 44 miles, in which I had half a dozen UPDs -
never serious, I ran out of all of them, but on similar-length rides on
an ungeared 29er or on the 26 guni, I'd hope to not have *any* UPDs,
really!)

I'd not be surprised if a proper 24" muni, big fat heavy tyre etc.,
rode better than this on-road, TBH; I was trying it more as an
experiment aiming for portability and ease of carrying.

--Alan


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The more I think about it the more I seem to lean towards a KH26" Guni
setup. So I will have to make some brake mount adapters and think about
handle options. Is there anybody around with this setup? Would be great
to hear some more opinions or see some more pictures before I go for it.


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The more I think about it the more I seem to lean towards a KH26" Guni
setup. So I will have to make some brake mount adapters...



If you weren't set on a KH, Nimbus now do a 26" frame with brake mounts
in the right place. Maybe you have considered this already.

Dan


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lowlight;1139231 wrote:
If you weren't set on a KH, Nimbus now do a 26" frame with brake mounts
in the right place. Maybe you have considered this already.




I dunno if the schlumpf would work in that frame though - I dunno if
it'd be possible with the bearing holders - they'd need grinding out
with the special grindy tool as a minimum. I'm not sure if the hub is
warrantied in that frame either.

Joe


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I dunno if the schlumpf would work in that frame though - I dunno if
it'd be possible with the bearing holders



oh yes of course, worth investigating still I think as the frame now
has machined bearing housings so possibly similar to the KH, maybe.


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lowlight;1139231 wrote:
If you weren't set on a KH, Nimbus now do a 26" frame with brake mounts
in the right place. Maybe you have considered this already.


Thanks lowlight, I did look at it, but I think my KH29 frame would be
better due to its lighter weight, friendlier crown and definitely
schlumpfable bearing holders. So I'll try and make some adapters for the
maguras.

I still have to decide on a good rim now:

There's the Nimbus http://tinyurl.com/2w7ghw
and then there's the Sun Double Wide, the Halo Combat and the Alex
DX32. Probably there are other options that I haven't even found yet.

It should have good braking surfaces and I think I would want to run
tires from 2,3" to 3" width. So I wonder, would the Nimbus be good for
that, or should I rather get something else?


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