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#1
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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 -- unisk8r ------------------------------------------------------------------------ unisk8r's Profile: http://www.unicyclist.com/profile/4660 View this thread: http://www.unicyclist.com/thread/53362 |
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#2
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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. -- trials_uni TRIALS 4 LIFE ! 'Check Out The Newbie Guide' (http://tinyurl.com/99yez) 'And the Spline Maintenance Guide!' (http://www.unicyclist.com/forums/showthread.php?t=52195) *Caution-I may have no idea what im talking about* ------------------------------------------------------------------------ trials_uni's Profile: http://www.unicyclist.com/profile/10953 View this thread: http://www.unicyclist.com/thread/53362 |
#3
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Another possible guni hub
i saw that in Moution Bike Action and was thinking the same thing -- unicyclepa www.unicyclepa.com we suck but its all good team YAMS member in your sig or title and say ------------------------------------------------------------------------ unicyclepa's Profile: http://www.unicyclist.com/profile/9246 View this thread: http://www.unicyclist.com/thread/53362 |
#4
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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. -- onetrack "People over here have a dangerous habit of adding quotes to signature lines." -Klaas Bil I pulled a sick trey varial hickflip over an 8 set yesterday, but unfortunately it was supposed to be seat in to seat out. I've named it the dioflip ------------------------------------------------------------------------ onetrack's Profile: http://www.unicyclist.com/profile/6374 View this thread: http://www.unicyclist.com/thread/53362 |
#5
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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 -- kington99 Dave - what a thoroughly post-modern subversion of the cycling genre - ------------------------------------------------------------------------ kington99's Profile: http://www.unicyclist.com/profile/9417 View this thread: http://www.unicyclist.com/thread/53362 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#6
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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 -- eenwieler-sander ------------------------------------------------------------------------ eenwieler-sander's Profile: http://www.unicyclist.com/profile/10956 View this thread: http://www.unicyclist.com/thread/53362 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#7
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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. -- harper -Greg Harper *jc is the only main man. there can be no other.* "Natural logs are what you ride on a Mun'e'." - kevinalexandersmith ------------------------------------------------------------------------ harper's Profile: http://www.unicyclist.com/profile/426 View this thread: http://www.unicyclist.com/thread/53362 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#8
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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 -- kington99 Dave - what a thoroughly post-modern subversion of the cycling genre - ------------------------------------------------------------------------ kington99's Profile: http://www.unicyclist.com/profile/9417 View this thread: http://www.unicyclist.com/thread/53362 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#9
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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) -- eenwieler-sander ------------------------------------------------------------------------ eenwieler-sander's Profile: http://www.unicyclist.com/profile/10956 View this thread: http://www.unicyclist.com/thread/53362 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
#10
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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 -- dangerdog once I was young and stupid....that was some time ago video http://au.youtube.com/watch?v=gDderUScDJQ ------------------------------------------------------------------------ dangerdog's Profile: http://www.unicyclist.com/profile/16398 View this thread: http://www.unicyclist.com/thread/53362 Posted Via Usenet.com Premium Usenet Newsgroup Services ---------------------------------------------------------- http://www.usenet.com |
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