KH "dual hole" cranks!?

Tjorning said:

has anyone got their hands on these yet?
they look pretty weird/good idea. poor man's gear shift!
[image:
http://www.unicycle.com/images/catalog/hardware/crankarmsplined/tn_kh_dualcranks8537.jpg]

You'll be spinning the exact same amount of rotations no matter what
size cranks you have, and on the shorter crank holes you'll have less
torque/leverage, and be making smaller circles as you pedal.

Imo, the main advantage with this setup is less leg movement, less
saddle soreness. And making smaller circles in your pedaling usually
also results in less wheel wobble and more efficient, smooth spinning,
which in effect, can increase your speed.

Switching to the shorter hole obviously is not the same as shifting a
GUni into high gear, because in that case, as we know, the wheel is
rotating *faster* than your pedal rotations. But then again, that's
probably why you called it the "poor man's gear shift.":p

PS: Having said all that, They do look cool and I want to get a pair
too! 🙂

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Anyone who's bought a KH29 in around the last year has these, as they
come standard. They're very handy--I swap the pedals around a lot,
depending on the terrain we're riding. I think they probably have at
least a little less strength than the regular cranks, when the cranks
are in the "long" position, but they aren't made for technical
muni/trials anyway.

I've been thinking about picking up the 165/137s to try out.

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Sure the drive ratio doesn't change but the gain ration does. In 125
mode you wheel moves 20% more for the distance you feet move.

I would love to have a set of 114/137 cranks to put on a 36er but alas
nobody makes them.

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saskatchewanian said:

Sure the drive ratio doesn't change but the gain ration does. In 125
mode you wheel moves 20% more for the distance you feet move.

I would love to have a set of 114/137 cranks to put on a 36er but alas
nobody makes them.

I have the staight (zero q) alum qu-ax 114's. I wonder if they make them
in 137mm-140mm. I'd like to have a pair of those with dual 114/140

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I use those cranks on my newly Schlumphed KH29 guni. The 150 holes are
great for offroad, and the 125 work great on the road.

saskatchewanian said:

I would love to have a set of 114/137 cranks to put on a 36er but alas
nobody makes them.

I brought that up as something I'd like to try on my KH-Schlumpf hub,
but everyone seemed to think 125s are as short as you'd want to go in
geared up mode. I went ahead and bought some ISIS 114s just to try
anyway. One of these days...

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MuniAddict said:

You'll be spinning the exact same amount of rotations no matter what
size cranks you have, and on the shorter crank holes you'll have less
torque/leverage, and be making smaller circles as you pedal.

Switching to the shorter hole obviously is not the same as shifting a
GUni into high gear, because in that case, as we know, the wheel is
rotating *faster* than your pedal rotations. But then again, that's
probably why you called it the "poor man's gear shift.":p

I was thinking a change in torque/leverage , not increased speed.

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I think someone should put 4 thin pedals on (one for each hole) and
video tape it. It would look really funny😄 :p

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I wonder if, when the pedal is in the short crank position, it is
possible for the left over crank nub to lever a foot off the pedal on
the upstroke. Like if the foot was a bit to far inside.

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feel the light said:

I wonder if, when the pedal is in the short crank position, it is
possible for the left over crank nub to lever a foot off the pedal on
the upstroke. Like if the foot was a bit to far inside.

only to the same extent that you can accidentally stand on the main
body of the crank during the downstroke, which for me happens pretty
infrequently.

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they should make 36ers isis so u can use them. Or just make cotterless
dual-holes cranks. I think that a 36er would benefit the most from
these

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unikid132 said:

they should make 36ers isis so u can use them. Or just make cotterless
dual-holes cranks. I think that a 36er would benefit the most from
these

Qu-Ax already make ISIS 36ers. Plus, if you're building your own
wheel, then you can pick and choose any* hub you want. However, the
main advantages of ISIS hubs and cranks is their strength - something
that isn't a big concern for 99% of big wheel riders.

But dual hole square taper cranks would be a fantastic upgrade for many
riders.

STM

* any 36 hole hub, of course. Unless you've managed to get Qu-Ax to
sell you one of their 48 hole rims on its own!

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semach.the.monkey said:

However, the main advantages of ISIS hubs and cranks is their strength -
something that isn't a big concern for 99% of big wheel riders.

And the main disadvantage of using an ISIS hub is that they're not as
wide as the coker hubs so sacrifice wheel strength, something which is
important to many riders. Unfortunately they don't make stock ISIS
bottom axles, from which unicycle hubs are made, in lengths suitable to
build a wide hub around.

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kington99 said:

And the main disadvantage of using an ISIS hub is that they're not as
wide as the coker hubs so sacrifice wheel strength, something which is
important to many riders. Unfortunately they don't make stock ISIS
bottom axles, from which unicycle hubs are made, in lengths suitable to
build a wide hub around.

The ISIS KH geared muni hub works quite wheel in a Nimbus 36"er
(modified) frame. It is wide enough to avoid flex.

http://tinyurl.com/yp7a7j

[image:
http://lh4.google.com/corbin.dunn/R_D_Tq79l0I/AAAAAAAACV4/XAGJd-2vPXA/s144/IMG_8276.jpg]

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corbin said:

The ISIS KH geared muni hub works quite wheel in a Nimbus 36"er
(modified) frame. It is wide enough to avoid flex.

http://tinyurl.com/yp7a7j

[image:
http://lh4.google.com/corbin.dunn/R_D_Tq79l0I/AAAAAAAACV4/XAGJd-2vPXA/s144/IMG_8276.jpg]

Yes, of course it isn't in the least bit standard and very expensive.
The point was that to keep prices down uni hubs are made from standard
bike axles, and they aren't available long enough. Perhaps it would be
worth someone making custom wide ISIS axles for uni hubs. I've ridden a
36 with the original schlump ST hub, the wheel stiffness isn't bad but
not as good as with a wide coker hub. Of course with the schlump the
flange diametre is much larger which will help to some degree.

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kington99 said:

Yes, of course it isn't in the least bit standard and very expensive.
The point was that to keep prices down uni hubs are made from standard
bike axles, and they aren't available long enough. Perhaps it would be
worth someone making custom wide ISIS axles for uni hubs. I've ridden a
36 with the original schlump ST hub, the wheel stiffness isn't bad but
not as good as with a wide coker hub. Of course with the schlump the
flange diametre is much larger which will help to some degree.

I thought the point of ISIS was to use a standard, instead of the
current problem that's developed: My old steel KH 24's cranks aren't
compatible with the Onza hub one's, which aren't compatible with the
newest ISIS ones. Yes, the KH schlumpf is expensive, but i think it is
the future of unicycling. The hub is definitely wide enough. I've put
it through it's paces, and it has worked quite well for me. I think the
Nimbus frame has some flex, which also occurred for me with the extra
wide hub, and forced me to stop using a magura brake.

corbin

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corbin said:

I thought the point of ISIS was to use a standard, instead of the
current problem that's developed: My old steel KH 24's cranks aren't
compatible with the Onza hub one's, which aren't compatible with the
newest ISIS ones. Yes, the KH schlumpf is expensive, but i think it is
the future of unicycling. The hub is definitely wide enough. I've put
it through it's paces, and it has worked quite well for me. I think the
Nimbus frame has some flex, which also occurred for me with the extra
wide hub, and forced me to stop using a magura brake.

corbin

a longer axle would still fit ISIS cranks, it would just give a wider
flange and bearing spacing. Don't get me wrong, I absoloutely love the
KH/Schlumpf hub and it is no doubt the future, but I can't afford one
right now, and no-one deals them in the UK.

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kington99 said:

I absoloutely love the KH/Schlumpf hub and it is no doubt the future,
but I can't afford one right now, and no-one deals them in the UK.

Except for UDC, of course;
http://tinyurl.com/32ydko

STM

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kington99 said:

Yes, of course it isn't in the least bit standard and very expensive.
The point was that to keep prices down uni hubs are made from standard
bike axles, and they aren't available long enough. Perhaps it would be
worth someone making custom wide ISIS axles for uni hubs. I've ridden a
36 with the original schlump ST hub, the wheel stiffness isn't bad but
not as good as with a wide coker hub. Of course with the schlump the
flange diametre is much larger which will help to some degree.
...
and no-one deals them in the UK

It is available in the uk
http://tinyurl.com/393rlw

In terms of stiffness, I don't think comparing the old schlumpf
unicycle to a non geared wide hub unicycle has any point, as the old
schlumpf hub had some side to side wobble in the internal hub bits
which was really noticeable, and then was typically put in an ultra
flexy schlumpf frame. Any wheel flex that you may get would be way less
than the frame flex and hub wobble on an old schlumpf 36.

Joe

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semach.the.monkey said:

Except for UDC, of course;
http://tinyurl.com/32ydko

STM

oh damn i was looking for a built uni with the hub. So I'd have to buy
a KH 29 then get the hub and some new spokes?

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