Changeable crank length

it's available in the Quality Bike Parts catalog, so just about any LBS
can order it. they will, however, increase the "Q" factor of your
cranks.

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Took me a while to figure out how they worked from the dimensions page;
the assemlby page made it a bit clearer-

http://www.ride2online.com/assembly.htm#top

Interesting that they're designed for a different function:-

"TANDEMS - Crankarm Shorteners are a device that allows an elementary
age child or short adult to ride on the back seat (the stoker's seat) of
a tandem bicycle. The Crankarm Shorteners reduce the length between the
stoker's seat and the pedals. Briefly, the pedal is removed from the
crankarm, the Crankarm Shorteners installed and the pedals are then
reinstalled on the Crankarm Shortener."

ie the adjustment is so those with short legs can use the bike, rather
than the leverage change that unicyclists would want them for; but, the
result is the same.

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brian.slater said:

*Price: $100USD is the best I saw on-line and in the LBS. *

That's quite a profit margin... from the designs it looks to be about
$12 in aluminum stock and 2 or 3 $1 bolts per crank.

For that much money you're better off buying two sets of cranks and
swapping 'em out with one bolt each.

This design might not stand up to the strains induced by trials
riding... I'm curious, why are you interested in these?

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maestro8 said:

*

That's quite a profit margin... from the designs it looks to be about
$12 in aluminum stock and 2 or 3 $1 bolts per crank.

For that much money you're better off buying two sets of cranks and
swapping 'em out with one bolt each.

This design might not stand up to the strains induced by trials
riding... I'm curious, why are you interested in these? *

If that's the case, why don't all cranks cost less? Normal cranks use
even less material.

Anyway, I don't think anyone would use these for trials. To start with,
they must be heavier because of the added material used to make it
adjustable. I have always thought that road use is where adjustable
cranks are the most useful.

It took me a while to understand how these cranks work. Now that I
think I have a grasp on that, I wonder how well they work.

Daniel

--
daino149 - On Vacation - till i find a job

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If i remember rightly, Nathan Hoover has adjustable cranks...might be
worth talking to him about them?

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unicyclistjoe - NZ's 2nd Best Trials Unicyclist

Well a MOPED or whatever you call it...yeah good one security

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daino149 said:

*

If that's the case, why don't all cranks cost less? Normal cranks use
even less material.

*

I bought some 7075-T6 to make some beefy MUni cranks, the same material
used in the Odyssey Black Widows and Kooka Kranks. The cost for six
cranks came out to less than $10 per crank.

In higher quantities, the price breaks might bring the cost down to $6
or $7 each, unless the manufacturer has the stock cut up at the
supplier, add (worst case) $1 each there.

The rest of the cost goes to paying the machinist, renting / leasing the
CNC machine and covering other overhead. Machinists charge a hefty
hourly wage, and CNC machines aren't something you can just buy off
eBay...

I'd say if people bought cranks like they bought soda pop, we'd see the
prices on these things plummet. But until then we should just gloat
that we're (collectively) pushing the edge of cycle sports... we're
breaking everything the industry is making, so we've gotta pay for them
to develop better products!

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unicyclistjoe said:

*If i remember rightly, Nathan Hoover has adjustable cranks...might be
worth talking to him about them? *

Yes, he does. However, they cost something like US$500. Bronson Silva
also has cool adjustable length cranks on his titanium suspension Coker.

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There is a past thread on some adjustable crank ideas: 'Adjustable crank
idea' (http://tinyurl.com/2plgy) I like the eccentric crank that Steve
Howard drew up in his CAD system. It just seems like a neat design.
It's similar in design to the cranks that Bronson Silva has on his
Creative Gecko bionic Coker.

Here's a link to Steve Howard's gallery of two adjustable crank designs
he drew up: 'Adjustable cranks gallery'
(http://gallery.unicyclist.com/cranks)

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