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Schlumpf gear-change unicycle hub prototype revealed

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  • Schlumpf gear-change unicycle hub prototype revealed

    Greg has some competition!

    http://www.velovision.co.uk/cgi-bin/...l?storynum=593
    Will

  • #2
    That looks pretty cool. The nub from the shifter doesn't seem to protrude as much as the KH so that shouldn't be an issue.

    If it can be used for Muni, that would be great. Many times on the flats I wished I could go a little faster.
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    • #3
      old pics new zealand pics new pics
      Where have I been riding? (GPS)

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      • #4
        This would be more practical to fit to a coker than the current shiftable hub, the shifting on the fly would mean you could start off in a normal gear and then shift up once you were going.

        Mmm, a coker or 29er with a normal cruising speed of 20mph instead of 12 would be great.

        Joe
        old pics new zealand pics new pics
        Where have I been riding? (GPS)

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        • #5
          Does the shifting on the fly by hitting it with your heel worry anyone else? It seems like it's in just the wrong place for an accidental shift. How would you like to be riding along at the 1:1 ratio and suddenly you are unexpectedly at 1:1.6?
          Blah Blah Blah BACON Blah Blah Blah
          --Harper a-la Catboy
          Still a work in progress . . .

          768

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          • #6
            I got e-mails today from Florian Schlumpf, the hub developer, and Peter Eland, the editor of VeloVision magazine concerning this article. Peter sent me the print issue. This looks really cool. Unfortunately, the photo I've seen doesn't show the business end of the hub but Florian indicates that he plans to go into production so he may not want to expose the whole package. He started development because "several unicyclists" contacted him recently. I wonder who those could have been?

            Familiar looking package, eh? I'm still haggling with overseas manufacturers and Florian probably has more experience along those lines. Unless he builds it in Germany which will put a huge pricetag on it.
            -Greg Harper

            Nipples...do you ever have enough?

            Change is good. Bills are better.

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            • #7
              Shifting

              I've got a Speed Drive on my recumbent, and accidental shifting is a non-issue. I've installed the "Easy Shift" levers, and it still takes a purposeful tap with the heel to shift. Less than purposeful though, and you can hit an in-between spot where the pedals just spin.

              I don't think it would be easy to shift "on-the-fly" unless you did some serious practice. Even on my bike, I "pause" or slow down pedaling to shift. To shift the uni hub would probably require a still stand type move, with cranks at 3 and 6 o'clock.

              The big advantage is that no tool and no dismount is required to shift.

              The frame in the photo on velo-vision has some pretty spindly legs to it. Some method of attaching a torque arm will be required, as on Greg's hub.
              Will

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              • #8
                Very cool indeed
                No one said it was gonna be easy and I'm not afraid to try, with the odds stacked up against me I will have to fight, One Life One Wheel got to do it right. H2O


                -------MUNI MILITIA -------
                One Wheeled Death Squad

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                • #9
                  that is pretty cool, i remember seeing this article and thinking that it could be pretty easily adapted to a unicycle hub
                  -Andrew Smit-

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                  • #10
                    Re: Shifting

                    Originally posted by willfcc
                    I don't think it would be easy to shift "on-the-fly" unless you did some serious practice. Even on my bike, I "pause" or slow down pedaling to shift. To shift the uni hub would probably require a still stand type move, with cranks at 3 and 6 o'clock.
                    On a unicycle, due to the fixed nature of the hub, won't the easiest way to shift the hub be to kick it across while you're pedalling at exactly the same speed as the wheel is turning?

                    Or is it purely the hassle of moving your feet to the right place that makes it hard to shift, rather than anything to do with the amount of torque on the gears making it harder to push across?

                    Joe
                    old pics new zealand pics new pics
                    Where have I been riding? (GPS)

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                    • #11
                      Re: Re: Shifting

                      Originally posted by joemarshall


                      On a unicycle, due to the fixed nature of the hub, won't the easiest way to shift the hub be to kick it across while you're pedalling at exactly the same speed as the wheel is turning?

                      Or is it purely the hassle of moving your feet to the right place that makes it hard to shift, rather than anything to do with the amount of torque on the gears making it harder to push across?

                      Joe
                      The Speed Drive is shiftable under load, so shifting while pedaling is normal. However, it does take slightly more effort to shift. The shifting motion involves pivoting your foot on the pedal at the proper position of pedal stroke to hit the shift button. "Easy Shift" levers make it easier.

                      If you're at speed, say 80-100 rpms, this will be difficult to perform, but not impossible. I find for me, it takes conscious effort to nail the shift at this rpm, and I think on a uni, this would cause me to UPDWS (Unplanned Dismount while Shifting).

                      Or, should that be Unplanned Dismount while Schlumpfing?
                      Will

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                      • #12
                        Re: Shifting

                        Originally posted by willfcc
                        ...with cranks at 3 and 6 o'clock...
                        OOPS. Should be 3 and 9 o'clock.
                        Will

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                        • #13
                          YIKES! 412$ for the bike version! And that thing has a huge marked compared to the unicycle hub.
                          What happens on the internet stays on the internet.

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                          • #14
                            He started development because "several unicyclists" contacted him recently. I wonder who those could have been?
                            Oh my goodness! That was Nick Green, a fellow Brisbane unicyclist. He contacted Schlumpf about this ages ago and their reply was, "Actually, we were just thinking about adapting our system to unicycles!" A little suspicious?

                            Andrew

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                            • #15
                              Did you guys know that 'Schlumpf' means smurf (the little blue guys with white pants) in german? It must have been interesting going through grade school with that one.

                              Cool hub! i hope i get to try one someday.

                              -erik
                              Neener, neener, neener. -harper

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