Internally geared hub as a jackshaft

[mechanix]

This actually isn't for an electric bike, it's for my downhill bike. It keeps destroying derailleurs, and I've decided to use an internally-geared hub as a jackshaft to eliminate the need for a derailleur. I figured that this would be the best place to ask my questions because of the wealth of knowledge on this forum. Not very much power will be going through this hub, as it will be used to downhill mountain biking. My main criteria for choosing a hub is:

1. Narrow form factor
2. Lightweight
2. Compatible with a trigger shifter
3. 7 or more gears
3. Inexpensive

It will be going on a 2007 kona stinky with a floating brake, my bike is similar to this one:

This is what gave me the idea:

http://www.gizmag.com/zeroed-g1-mountain-bike/18570/

The shimano line of hubs are looking promising... Thanks in advance for the input!

Joel

 

[bobc]

Interesting article - I can see they get a few advantages at the expense of a fair bit of weight. At first glance I thought is was an insane idea!
Main advantage seems to be that by pivoting the rear suspension triangle high up they "eliminate pedal bob" - Very interesting!
Major changes to the kona to move the rear suspension pivot: - you really want it to pivot round the IGH axle to keep chain tight - should be doable though.

 

[Miles]

You might like to review the archive:
http://www.g-boxx.org/10-bikes_history.html

 

[Miles]

Another, more recent one, from my Bookmarks:
http://www.pinkbike.com/news/allen-millyard-part-1-2008.html

 

[Paul_G]

what about the Suntour Vboxx like they use on a Stealth Bomber?

DL manual of it: http://www.srsuntour-cycling.com/customGates/scripts/download.php?filename=owners_manuals_2010/2010_OWNERS_MANUAL_VBOXX.pdf

Paul G

 

[Iokoc]

I'm building something like this, any sugestions?

 

[Overclocker]

was thinking of doing that w/ the primary reduction stage of my GNG kit. since the primary stage has high-RPM hence low torque, so the forces that the IGH would see are lower

 

[spinningmagnets]

I've been interested in this for a while. Not interested enough to actually build something, but...I did save a pic.

 

[gogo]

I've been interested in this for a while. Not interested enough to actually build something, but...I did save a pic.

That geometry also allows the use of belts without needing a frame break.