crank quick-release for Cokers?

That's why the Schlumpf hub was invented.

Other people use adjustable cranks. Who wants to carry multiple sets of
cranks around? The problem is, adjustable cranks are expensive, and may
not be very strong.

I don't like using my Coker for MUni for the same reason; changing the
cranks causes wear & tear, both to the axle and to the threads on the
cranks. Yup, a pair of adjustables would sure be nice...

Nathan Hoover has some that I think work well for him.

--
johnfoss

John Foss, the Uni-Cyclone
"jfoss" at "unicycling.com" -- www.unicycling.com

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Actually the only extra tool you need to carry is a crank puller,
provided you have a 'crank/pedal tool' (http://tinyurl.com/bc3r4)
already. You can use the pedal wrench end of the crank/pedal tool on
the crank puller - not a perfect fit but it saves you having to carry
another wrench. There's no way to avoid the extra weight of the spare
pair of cranks, however.

I am considering doing this in the upcoming 160km / 100mile Lake Taupo
Cycle Challenge - starting on 125mm cranks for the first hilly 100km
then changing to 114mm cranks for the reamaining flat 60km.

--
TonyMelton

The way to a man's heart is through his veins.
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leadpan said:

Am I the only person with this dilemma? Thanks

Nope. I don't like changing the cranks either, and I'd never consider
doing it in the middle of a ride.

There have been some discussions about adjustable crank ideas. One
thread is here: 'Adjustable crank idea'
(http://www.unicyclist.com/forums/showthread.php?t=30079). And in
particular 'this post' (http://tinyurl.com/clzt9). One of those two
designs would make crank changes on the road an easy task. Now someone
needs to make the cranks. 🙂

--
john_childs

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In the past I would change the Coker cranks all the time to match the
terrain I was riding, after a couple years of that my hub threads where
destroyed. I swapped out to my old KH hub and how I can switch between
170mm and 140mm in less then 5 minutes which I often do when I hit a
long uphill. I have thinking about cutting down a set a cranks to 110mm
to give me something for the road, so if anyone has a old set of KH
cranks laying around PM me.

--
muddycycle
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Although a 6in. crank would remain that length why could'nt a second or
third set of 9/16ths holes be drilled and tapped into a crank arm?

--
cheech
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cheech said:

Although a 6in. crank would remain that length why could'nt a second or
third set of 9/16ths holes be drilled and tapped into a crank arm?

It can be done. 'daVinci Designs'
(http://www.teamspirit.net/comp.html#cranks) makes such a crank.Some
people have used the daVinci crank on unicycles. The cranks have pedal
holes for 130/150/170.

--
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john_childs said:

Nope. I don't like changing the cranks either, and I'd never consider
doing it in the middle of a ride.

There have been some discussions about adjustable crank ideas. One
thread is here: 'Adjustable crank idea'
(http://www.unicyclist.com/forums/showthread.php?t=30079). And in
particular 'this post' (http://tinyurl.com/clzt9). One of those two
designs would make crank changes on the road an easy task. Now someone
needs to make the cranks. 🙂

It would be -fantastic- if someone made a decent set of adjustable
cranks, maybe based on one of the designs in the links above.

Has anyone got any idea of why so much effort has gone into making
geared hubs, and so litle into adjustable cranks?

Adjustable cranks have to following pros-

1. simplicity- fewer mechanical problems
2. fits in with the 'unicycle ethos' of 'doing more, with less'
3. once in production, would be much cheaper
4. could be easily fitted to any existing unicycle

Certainly, while I would not be interested in aquiring a geared
unicycle, i would -definitly- want to purchase some decent adjustable
cranks.

So, why is there so little interest in making them?

--
onewheeldave

"You can't outrun Death forever.
But you can make the [censored] work for it."

--MAJOR KORGO KORGAR,
"Last of The Lancers"
AFC 32
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cheech said:

Although a 6in. crank would remain that length why could'nt a second or
third set of 9/16ths holes be drilled and tapped into a crank arm?

This is possible but there is potential to bash your ankles and
possibly rip trousers. I have ruined several pairs of trousers by
catching the trouser leg end on my kooka cranks and imagine this could
be an issue with the above design. (Of course you could just make sure
you wear shorts)

--
peter.bier

-Peter Bier
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U-Turn showed me a set of cranks that had three holes drilled in the
cranks, effectively providing three different crank length sizes...
with no more effort required than changing a pair of pedals. I suppose
these aren't any good for Muni?

--
HardcoreCokerRider
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HardcoreCokerRider said:

U-Turn showed me a set of cranks that had three holes drilled in the
cranks, effectively providing three different crank length sizes...
with no more effort required than changing a pair of pedals. I suppose
these aren't any good for Muni?

I'd say those daVinci cranks (available through 'LiveWire'
(http://www/livewireunicycles.com) too) are most suited for the full
range of road and mild off-road riding, though I don't know that anyone
has really pushed them outside those boundaries. I did get a set to
Australia with a 36" wheelset, but don't know what the rider has been
able to do with them.

Edit: tuck in your laces! 😉

--
U-Turn

Weep in the dojo... laugh on the battlefield.
'LiveWire Unicycles' (http://www.livewireunicycles.com)
'Strongest Coker Wheel in the World'
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'29er Tire Study' (http://u-turn.unicyclist.com/29erTireStudy/)
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-- Dave Stockton
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The best adjustable cranks I've seen are Bronson Silva's rotational
crank. You dialup the lenght you want than screw it down. I don't
have a photo sorry.
But here it is:
http://community.webshots.com/photo/50814872/53203184LJuoxV

--
GizmoDuck

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'Laos Unicycle Tour' (http://www.laosunitour.org)
'New Zealand Unicycle Federation' (http://www.unicycle.org.nz)

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er, that's 'LiveWire' (http://www.livewireunicycles.com). (thanks Tom!)

--
U-Turn

Weep in the dojo... laugh on the battlefield.
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Nathan Hoover had a different design of adjustable cranks when he came
to NZ for the Moonride. From memory the part of the crank near the axle
was a square sleeve inside which the inner adjustable part of the crank
slid. They could be adjusted to multiple lengths, but its weak point
was that the inner sliding part of the crank was held in place by
little set screws which would get shaken loose. At least thats what
happened when ridden offroad.

--
TonyMelton

The way to a man's heart is through his veins.
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I have been enjoying 'daVinci'
(http://www.teamspirit.net/comp.html#cranks) Adjustable Cranks
170/150/130 for over 6 months now with perfect success. They seem very
well made.

I ride them on my Coker, mostly on pavement. Changing effective crank
length is easy: use a pedal wrench to remove and reinstall the pedals
in a different set of holes. Then adjust seat height and away you go.

I like these cranks. I can hardly wait to install them on my
soon-to-arrive 'LiveWire' (http://www.livewireunicycles.com/) 36 with
Stockton bomber wheel. WooHoo!

--
trailguy
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U-Turn said:

er, that's 'LiveWire' (http://www.livewireunicycles.com). (thanks Tom!)

?huh

+-------------------------------------------------------------------+
|Filename: 53203184LJuoxV_ph.jpg |
|Download: http://www.unicyclist.com/attachment/10725 |
+-------------------------------------------------------------------+

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'Laos Unicycle Tour' (http://www.laosunitour.org)
'New Zealand Unicycle Federation' (http://www.unicycle.org.nz)

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GizmoDuck said:

?huh

I had the link wrong Ken; nothing to do with the Gecko crank.
🙄

--
U-Turn

Weep in the dojo... laugh on the battlefield.
'LiveWire Unicycles' (http://www.livewireunicycles.com)
'Strongest Coker Wheel in the World'
(http://www.unicyclist.com/gallery/albup39)
'29er Tire Study' (http://u-turn.unicyclist.com/29erTireStudy/)
'New York Unicycle Club' (http://www.newyorkunicycle.com)
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I just visited Tom Miller, who has made custom unicycles for 30 years.
I'm sure he would be willing to make adjustable cranks for someone. You
can contact Tom at 765-452-2692

Tom has a machine shop in his garage and just finished making a
"walking" unicycle. It's kind of like walking on stilts. He made it the
way his customer wanted, but he's not happy with the design yet.

He's now working on a very small bicycle for another customer. The size
that can fit in your hand.

--
kokomojuggler

Kokomo Juggler
-All Glory to God
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