Geared Giraffe?

Shippy · 2012-01-16, 04:01 PM

would it be possible to make a geared giraffe unicycle? has anyone done it yet

jam96 · 2012-01-16, 04:13 PM

scotthue · 2012-01-16, 04:24 PM

Geared up has been done before as you can see in that link. However, we're you looking to be able to shift while riding?

tholub · 2012-01-16, 05:32 PM

The crank system on a giraffe is essentially identical to a bike bottom bracket, which means you could use the Schlumpf Mountain Drive, the original inspiration for the unicycle hub. But it looks like Schlumpf isn't manufacturing them anymore.

http://www.schlumpf.ch/hp/schlumpf/g....2012.engl.htm

vookash · 2012-01-16, 08:25 PM

You can build your wheel on a fixed geared hub (e.g. http://www.sturmey-archer.com/products/hubs/cid/3/id/47).

Shippy · 2012-01-16, 09:28 PM

i was thinking more alone the lines of the schlumpf hub, being able to change gear while riding

johnfoss · 2012-01-16, 09:45 PM

Quote:

Originally Posted by Shippy

i was thinking more alone the lines of the schlumpf hub, being able to change gear while riding

You could use a Schlumph in the wheel, and rig some little levers to shift it while sitting up there. Pull a string, it pulls the lever and boom! Shifted.

So how much are you willing to invest in a giraffe? Actually, this idea would work best with the earlier (non-muni) version of the hub. Otherwise you'd need a custom frame with the right bearing holders. Actually you'd need that in any case. But a cusrom frame would still be cheap compared to the hub...

jam96 · 2012-01-16, 10:00 PM

Quote:

Originally Posted by johnfoss

You could use a Schlumph in the wheel, and rig some little levers to shift it while sitting up there. Pull a string, it pulls the lever and boom! Shifted.

So how much are you willing to invest in a giraffe? Actually, this idea would work best with the earlier (non-muni) version of the hub. Otherwise you'd need a custom frame with the right bearing holders. Actually you'd need that in any case. But a cusrom frame would still be cheap compared to the hub...

How would you drive the hub?

EDIT: You could attach a Right-hand bike crank to both of sides of the hub, cut the crank arms off, and attach a chain wheel to both of the cranks. Then, attach the Bottom Bracket and crank with a chain wheel either side, and you'd have a Schlumpf-twin chain Giraffe.

Or, you could use a Schlumpf and build it into a stack...

aracer · 2012-01-17, 12:19 AM

The easier solution has surely already been given - use a fixed gear hub designed to be used as a hub, rather than adapting a Schlumpf. The only issue is how much backlash you get in one of those. No problem with changing gear - just run the gear cable up the frame to the seat.

bungeejoe · 2012-01-17, 05:43 AM

Quote:

Originally Posted by Shippy

would it be possible to make a geared giraffe unicycle? has anyone done it yet

http://www.unicyclist.com/forums/sho...462#post545462
I still have it. Several way to do it. This one has second gear locked up leaving 1st and 3rd with no freewheel on a five footer with shifter mounted below the seat on the seat post.

JM

2012-01-16, 04:01 PM	#1
Shippy I couldn't afford a whole bike..... Join Date: Jul 2011 Location: Bristol, UK Posts: 120	Geared Giraffe? would it be possible to make a geared giraffe unicycle? has anyone done it yet

2012-01-16, 04:13 PM	#2
jam96 Registered User Join Date: Aug 2010 Location: Leicstershire, UK Posts: 88	Yes, it's been done before __________________ Jam Last edited by jam96; 2012-01-16 at 04:14 PM.

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2012-01-16, 04:24 PM	#3
scotthue 10k & Marathon World Champ Join Date: Mar 2007 Location: Minneapolis, MN, USA Age: 20 Posts: 961	Geared up has been done before as you can see in that link. However, we're you looking to be able to shift while riding?

2012-01-16, 05:32 PM	#4
tholub Totally Doable Join Date: Apr 2002 Location: Berkeley, CA Age: 44 Posts: 3,245	The crank system on a giraffe is essentially identical to a bike bottom bracket, which means you could use the Schlumpf Mountain Drive, the original inspiration for the unicycle hub. But it looks like Schlumpf isn't manufacturing them anymore. http://www.schlumpf.ch/hp/schlumpf/g....2012.engl.htm

2012-01-16, 08:25 PM	#5
vookash ('')( :)(..)(: )('') Join Date: Jan 2010 Location: Krakow, Poland Age: 31 Posts: 868	You can build your wheel on a fixed geared hub (e.g. http://www.sturmey-archer.com/products/hubs/cid/3/id/47).

2012-01-16, 09:28 PM	#6
Shippy I couldn't afford a whole bike..... Join Date: Jul 2011 Location: Bristol, UK Posts: 120	i was thinking more alone the lines of the schlumpf hub, being able to change gear while riding

2012-01-17, 12:19 AM	#9
aracer Registered Unicyclist Join Date: Oct 2011 Location: Malvern, UK Age: 43 Posts: 1,038	The easier solution has surely already been given - use a fixed gear hub designed to be used as a hub, rather than adapting a Schlumpf. The only issue is how much backlash you get in one of those. No problem with changing gear - just run the gear cable up the frame to the seat.

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