Another possible guni hub
 

Fallbrook Technology will manufacture (and has already licensed to
Ellsworth Cycles) this new Constant Velocity Transmission hub, named
NuVinci. It has continuous ratios from 1:1 to 3.5:1, but is made as a
normal freewheeling bike hub. Maybe they could be persuaded to make a
fixie version?
http://www.fallbrooktech.com/NuVinci.asp


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Another possible guni hub
 

3.5:1!!!!!!! Holy cow...That would make a 29er into a 90" wheel...Thats
nuts in my opinion...But hey what do i kno about such things as this.


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Another possible guni hub
 

i saw that in Moution Bike Action and was thinking the same thing


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Another possible guni hub
 

does that design gradually increase the ratio as you pedal faster? Not
sure that I am exactly a fan of that.


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Another possible guni hub
 

if anyone's interested I have a Nuvinci hub sitting on my desk
currently. It will never make it as a unicycle hub in anything like its
current guise. The ratchet is easily removed but the hub won't sustain
large reverse torques, so will slip when you try and slow down. Also
this thing is heavy like you wouldn't believe


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Another possible guni hub
 

kington99;1170981 wrote:
if anyone's interested I have a Nuvinci hub sitting on my desk
currently. It will never make it as a unicycle hub in anything like its
current guise. The ratchet is easily removed but the hub won't sustain
large reverse torques, so will slip when you try and slow down. Also
this thing is heavy like you wouldn't believe



the last part looks strange to me because i have tried a bike with the
nuvinci hub and i could stand on the pedals and it dit not slip

although when i put force on the pedals you can not shift

and indeed this hub is to heavy


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Another possible guni hub
 

eenwieler-sander;1170983 wrote:
the last part looks strange to me because i have tried a bike with the
nuvinci hub and i could stand on the pedals and it dit not slip





kington99 specified -reverse- torque. The CV hub is probably designed
so that the frictional force is increased with forward torque (like a
rotating lock down) and decreased with reverse torque. Hence, you can
stand on the pedals and it won't slip and you can reverse the direction
and get it to slip by hand.

Sturmey Archer and some other free-wheeling geared hubs have a
directional design, also. Their gear teeth are more like ratchets and
will easily lock in the forward direction but slip in the reverse
direction.


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Another possible guni hub
 

harper;1170989 wrote:
kington99 specified -reverse- torque. The CV hub is probably designed so
that the frictional force is increased with forward torque (like a
rotating lock down) and decreased with reverse torque. Hence, you can
stand on the pedals and it won't slip and you can reverse the direction
and get it to slip by hand.

Sturmey Archer and some other free-wheeling geared hubs have a
directional design, also. Their gear teeth are more like ratchets and
will easily lock in the forward direction but slip in the reverse
direction.



indeedy, as far as i understand the hub works by the properties of a
non-newtonian fluid, it effectively goes solid when trapped between the
ball and the cone. Presumable when running in reverse the fluid isn't
subjected to suitable pressures to cause this effect, allowing it to
slip. Haven't tried this myself but it is the accepted wisdom of other
car racers who use them, it;s significant as it throws out the
possibility of regen braking


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Another possible guni hub
 

harper;1170989 wrote:
kington99 specified -reverse- torque. The CV hub is probably designed so
that the frictional force is increased with forward torque (like a
rotating lock down) and decreased with reverse torque. Hence, you can
stand on the pedals and it won't slip and you can reverse the direction
and get it to slip by hand.

Sturmey Archer and some other free-wheeling geared hubs have a
directional design, also. Their gear teeth are more like ratchets and
will easily lock in the forward direction but slip in the reverse
direction.



oke i did not read that part good i think englich is alsow not my first

i can see how it would slip because of the no torgue at the point you
are starting to push backwards.

i know how the other geared hubs work (working on the saterday;s at my
lbs)


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Another possible guni hub
 

I am keen on the potential of the duvinci hub for unicycle use,however
it would require a bit of re-engineering in order to be suitable.The
standard hub is listed as having a gear range of 0.5 to 1 ratio through
to 1.75 to 1 ratio,this range of gearing would be very suitable for a
unicycle.An example with a 26" wheel would be an effective range of 13"
through to 45.5" I think that would cover almost all gearing
requirements.

I emailed about 6 months ago and they said they have no intention at
this stage to make a unicycle hub.

The reply

John,
We appreciate your enthusiasm for the NuVinci CVP. At this time, we
don't have plans to adapt the hub for use in a unicycle. Maybe
someday...

Regards,
R. Scott Harris
Director - Customer Services
ATC
9901 West Reno
Oklahoma City, OK 73127
Ph: 405-577-9925
Fax: 405-577-9922
Cell: 405-229-2507

www.atcnuvinci.com


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