two sprockets

I did some more reading around, and I stumbled upon this
http://www.tux.org/~bagleyd/unicycle_factory/sprockets.html
would the sprockets in picture #4 work, or is there something special
that needs to be done to the wheel in order to do this? (sorry if this
is amature type stuff. I just ride, but I am clueless to how everything
works)

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a flip flop pike hub might work. although dont know where youd get the
cranks

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The Catboy said:

This one time i was at that place doing stuff and then i did something
and I was like "Pshawww" but then I forgot.

http://willowglenbicycles.com/index.cfm
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Have you looked at Tandem bike parts as some of them have chainwheels on
both the left and right handed cranks

jim

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UDC makes a good 'dual chain giraffe' (http://tinyurl.com/qhexl). It's
currently out of stock. Don't know when they'll make another batch.

If you want to build one yourself then one option for the dual chain is
to use a fixed gear hub that has a disk brake mount. Drill a cog to
fit the 5 hole disk brake mount. The cog bolted to the disk brake
mount will not come unscrewed while riding. Very secure, very safe.
Just takes some custom machining to drill the 5 bolt holes in the cog
properly centered and spaced.

You should be able to find cranks and a bottom bracket (mid bracket?)
that will let you put chain sprockets on both sides. BMX bike
components often come now with options for left hand drives so you can
find BMX cranks that will accept a sprocket on the left crank. There
is also the option of tandem bike cranks. Tandems have sprockets on
the left hand side.

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I sopose you would use a tandem back crankset, and a dualsided track
rear hub.

Are you building the frame yourself?

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lleberg

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lleberg said:

Are you building the frame yourself?

No, I'm more or less modifying a Torker TX with a new wheel and all.
Thanks for the help you've all given me, though! I think I may have an
idea how it's going to work now.

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Why two chains? It might be hard to make it work on an existing giraffe,
so be prepared for lots of custom work. Your crankshaft and hub, at a
minimum, will need to be custom.

I don't have much experience with double-chain giraffes myself. I think
they are more about looks than anything else, though there is the
obvious redundancy if a chain fails (which can be dangerous if it's in
mid-trick or mid-show). On the downside, you have to deal with twice
the greasiness (something to consider for car transport and pants
legs), twice the chain tension adjustment, and the possibility of one
chain becoming longer than the other, making proper tensioning
impossible.

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Well I guess that that makes sense because mountain bikes only have one
chain. Or would it be too much stress on just one chain because its
direct drive, not geared?

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Double-chained giraffes are much stronger than single-chained giraffes,
tensioning the chain on a single-chained giraffe is like tightening the
string on a bow and creates a lot of one-sided forces on the unicycle.
You can feel this bow-like effect if you try bunny-hopping on a
single-chain giraffe

Although double-chained giraffes are harder to produce as there is less
tolerance on sprocket alignment, once it is set up correctly having two
chains eliminates the slack spots you can get on single-chain giraffes
and the slack you can get when idling on a single-chain

Having two chains makes a stronger machine which is more pleasant to
ride

It is not really comparable to a mountain bike as you are not balancing
on a pole above a single fixed wheel when you are on a bike

Giraffe chains do not need a lot of oiling as they are not ridden
outside in unpleasant weather (or close to the ground behind a front
wheel spraying up dust or mud) like on a bicycle. A light oiling is
sufficient and wipe off the excess with a cloth, the chain shouldn't
need to be greasey.

jim

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Does anyone have links to where I could get or look at any of the parts
above? I've been searching and searching with no luck. To save you the
time of reading through, the parts listed are a flip flop pike hub,
tandem cranks, a fixed gear hub with a disk brake mount, and a
dualsided track rear hub.

P.S. Sorry if I'm making this thread longer than it should be, I just
want to get everything right.

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