Re: why not use Nexus hub?

I think some people have done with sturmey archer hubs

there are problems though, for several reasons, including

a) bike geared hubs aren't fixed gear and they're only designed to take
forces in once direction even if you were to disable the freewheel.

b) bike hubs aren't designed to be driven by the centre axle.

Joe

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The reason I ask is that I want to build a bicycle without a chain or
shaft. Basically a unicycle design with a front wheel. But still keeping
some resemblence of the road riding position.
But I would still like to have shifting capability. I thought of the
reasons you mentioned for not using a Nexus hub, but think the issue of
converting a Nexus hub to a drive axel might be possible.

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UniFrank made a geared hub using the parts from a used Nexus hub.
'UniFrank's web page' (http://www.unicycle.de.vu/) Click on English
Version then Planetary gear hub
There's a little bit more info in 'this thread'
(http://tinyurl.com/chus5)

'Greg Harper' (http://staff.washington.edu/gharper/) has also made a
geared hub. Drawings and info are on his web site.

'Schlumpf' (http://www.schlumpf.ch/uni_engl.htm) is now making a
commercial version of the planetary geared hub

Then there is the 'Outta Phaze'
(http://www.livewireunicycles.com/Outta%20Phaze.htm) jack shaft geared
design. But it's not shiftable. The design of the Purple Phaze or
Outta Phaze frame may give you the riding position you're looking for.

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maybe do something like this? it's got a 3-speed geared hub.

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Wow, that looks like an offroad ENDO-CYCLE! I see suspension on the
front wheel, but no apparent room for the wheel to move upward.

In otherwords, at first glance it appears to me like an extremely dumb
vehicle for riding off road. I would think the rider would want to be
further toward the back, rather than the front, to prevent endos. But
then again, I never rode a tricycle on mountain bike trails either, so
maybe it works great!

Similar question for maxmyer. If you're pedaling directly off the wheel
axle but want a bike-type riding position, your center of mass is going
to be pretty close to directly above the axle. I would recommend more of
a relaxed, or even recumbent position.

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mikepenton said:

*it's got a 3-speed geared hub. *

You sure? I can't see anything about gears on the Q-bikes home page
....

http://qbike-online.com/

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mikepenton said:

*it's got a 3-speed geared hub. *

You sure? I don't see anything about gears on the Q-bikes home page
....

http://qbike-online.com/

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goldenchicken II said:

*You sure? I don't see anything about gears on the Q-bikes home page
....

http://qbike-online.com/ *

I'm only going on what I was told by the rider, it's likely that I'm
correct. it's a freewheel hub too. I was most disappointed when he told
me!
John, you have no idea how right you are about it's unsuitability for
off-road! he was under team instructions to do a slow last lap a t
Mountain Mayhem, so thought he'd give this a go. At this point, 6 miles
into the 10 mile lap, the rear wheel was barely spinning due to the disk
brake, and a front brake block had fallen off! it only cost £50 off ebay
though so he wasn't too unhappy. he was overtaking a lot of riders on
the downhills too!

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