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Jackshaft bike aside from BMW??

Discussion in 'Downhill & Freeride' started by rbx, Sep 5, 2005.

  1. rbx

    rbx Monkey

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    Dindt find any do you guys know of any other brands?(real jackshaft not pulley system a la bb7)
     
    #1 -   Sep 5, 2005

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  2. vitox

    vitox Turbo Monkey

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    clifcat and balfa made jackshaft bikes, there are more in europe too.
    i think theyre called the holeshot and nouvau riche respectively.

    oh and do a search for devinci big bang
     
    #2 -   Sep 5, 2005
  3. narlus

    narlus Eastcoast Softcore
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    would the cannondale fulcrum qualify? they weren't issued for sale, though, i believe.
     
    #3 -   Sep 5, 2005
  4. Anders

    Anders Monkey

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    didnt gack make one?
     
    #4 -   Sep 5, 2005
  5. Bulldog

    Bulldog Turbo Monkey

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    Gack.
     
    #5 -   Sep 5, 2005
  6. rbx

    rbx Monkey

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    Checking clifcat website i think they dont make jackshaft bike anymore
    Also looking for frames still in production,the gack seems ok, oh well seems that i am going to have to go with the BMW(not that is bad far from it but the price!!..ouch)
     
    #6 -   Sep 5, 2005
  7. DHS

    DHS Friendly Neighborhood Pool Boy

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    all the jackshaft bikes were super expensive. the Gack is a cheaper version of the BMW but still a lot. the Clifcat weighed more then i care to post, and had something like 10-11inch of travel. get a bmw. i enjoy mine.
     
    #7 -   Sep 5, 2005
  8. sikocycles

    sikocycles Turbo Monkey

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    Once you add in the cranks,bb and the guide. The bike in not that much more than other things
     
    #8 -   Sep 5, 2005
  9. ChrisRobin

    ChrisRobin Turbo Monkey

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    Clifcat can still make them they're special ordered.

    I remember talking to Bill (Clifcat owner) about it a few years ago and he said to save weight he would sometimes put a pulley at the pivot to simulate a jackshaft. He said it felt just as good.
     
    #9 -   Sep 5, 2005
  10. rbx

    rbx Monkey

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    I keep reading and hearing that bikes with pulleys like balfas dont pedal well not because of bad suspension design,but of friction created by the pulley.

    I maybe way off
     
  11. ChrisRobin

    ChrisRobin Turbo Monkey

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    I don't see how there could be much less friction with a true jackshaft frame: You have your main bottom bracket at the bottom where your cranks are, with a chain driving the other chainring attached to the pivot (on the Clifcat bikes it was a second Profile bottom bracket in the pivot), which drives the chainring on the other side of the frame which drives the rear wheel.

    I may be way off too.
     
  12. Sverre

    Sverre Monkey

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    Here's one

     
  13. jackalope

    jackalope Mental acuity - 1%

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    What is that new GT - IT bike? And how 'bout Zedro's file cabinet? :monkey:
     
  14. ChrisRobin

    ChrisRobin Turbo Monkey

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    Haven't heard much news about that new GT bike lately...

    And zedro's bike has a pulley, no jackshaft.
     
  15. skatetokil

    skatetokil Turbo Monkey

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    That may actually be the ugliest bike I've ever seen in my life. What on earth were they thinking?
     
  16. MisterMental

    MisterMental Monkey

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    nah it needs green doublewides and a bannana seat
     
  17. rbx

    rbx Monkey

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    Totally forgot about the GT-It1 ok i think my problem is solved:) thanks for the help guys!
     
  18. ChrisRobin

    ChrisRobin Turbo Monkey

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    Hold on a sec...apparently there's been some e-rumours and e-speculation going around saying they're having trouble with the Nexus hub.
     
  19. konabiker

    konabiker Monkey

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    Drops to flat.


    What I dont get is why they are running that funky azonic stem...as if the front end wasn't high enough already?
     
  20. rbx

    rbx Monkey

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    Weird the last i heard from a thread on RM is that GT worked with shimano and solved the problem..but i am still confused??

    Ostie de Gt ils le sortiront jamais leur bike!
     
  21. ChrisRobin

    ChrisRobin Turbo Monkey

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    I missed that part about Shimano fixing their problem.
     
  22. Percy

    Percy Monkey

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    They werent thinking!

    The front of that looks higher than an MXer.
    Rediculous.
     
  23. MisterMental

    MisterMental Monkey

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    aint it a mr dirt stem? or am i stoned
     
  24. DHS

    DHS Friendly Neighborhood Pool Boy

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    so shimano fixed their problem. doesn't change the fact that the GT has 19" chainstays.
    i don't feel any of this tension on the right side or left side of my BMW, i could feel it on the balfa though, but can't feel it on the canfield.
     
  25. MikeD

    MikeD Leader and Demogogue of the Ridemonkey Satinists

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    A Nucleon owner posts in the thread and no mention of the Nucleon...?

    A kiwi posts and no mention of Lahar??

    MD
     
  26. ChrisRobin

    ChrisRobin Turbo Monkey

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    Ahhh...that's because the Nucleon ST isn't a 100% true jackshaft bike.

    The Nucleon TST is just way expensive right now.
     
  27. MikeD

    MikeD Leader and Demogogue of the Ridemonkey Satinists

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    How so?
     
  28. ChrisRobin

    ChrisRobin Turbo Monkey

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    The Nucleon ST doesn't have the Rolhoff hub in the pivot. It's just ahead of it. There's almost no chainstretch but there is still some...so that why I have to run that Rohloff tensioner.

    The Nucleon TST does have the gear hub in the pivot so it could be seen as a jackshaft system...unless I'm missing something.
     
  29. BMXman

    BMXman I wish I was Canadian

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    ah...ok trade me your Nicolai ST for a KHS Dominatrix :D
     
  30. Percy

    Percy Monkey

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    Well the Lahar isnt really a jackshaft bike! Which is what the thread is all aboot.

    They are well tasty though laddie! :thumb:
     
  31. MikeD

    MikeD Leader and Demogogue of the Ridemonkey Satinists

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    Where's the Rohloff mounted, then? Right at the crank or something? I thought it used a primary/secondary drive configuration...my bad...

    Ed: I guess it has to have a primary/secondary if it's got a rohloff...just that they're not arranged in a jackshaft layout.

    MD
     
  32. xy9ine

    xy9ine Turbo Monkey

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    here's the config (that's the main pivot behind the hub):
     

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  33. ChrisRobin

    ChrisRobin Turbo Monkey

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    Neat.
     
  34. rbx

    rbx Monkey

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    Geez just got the geo. specs for IT1 the chainstay is 17.75" with no sag!!
    At 30-35% sag it close to 18.94"!!! thats damn to long...way to ruin a good idea