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Re: Surly Dingle and IGH

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  • Rich Wood
    BTW for those interested who have not seen it yet here is a link to the Cyclo data sheet on the SA Heritage web site.
    Message 1 of 5 , Jun 30, 2009
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      BTW for those interested who have not seen it yet here is a link to the Cyclo data sheet on the SA Heritage web site.

      http://www.sturmey-archerheritage.com/detail.php?id=316

      Rich Wood


      --- In Geared_hub_bikes@yahoogroups.com, "Rich Wood" <astronut1001@...> wrote:
      >
      > palatine_ej;
      >
      > Most steps on the iM9 are about 14% with the end steps about 17% so a half step pair should have a difference of 7% to 8%. Very small steps. The factory sprockets are listed as 18T through 22T so a 18 and 19 would give about a 5.5% difference and a 18 and 20 would be close to 11%.
      >
      > I would think a pair at least 2 teeth different to provide a bailout low gear might be the way to go, or a pair chosen so the normally used one provides an adequate low and the secondary small sprocket provides a high speed downhill/tailwind option.
      >
      > Looking at my iM9 hub the clearance between the shifter cable connector tube and sprocket is fairly tight and iM9 sprockets are flat so it looks like there would probably be interference between the outer sprocket and the shifter connector tube.
      >
      > It might be easier to do a dual sprocket setup with a P5 or S7 as both have the hub shifting bits outside the dropouts on the frame. As they use industry standard sprockets a 2 speed Cyclo sprocket set might drop right on, or do so with minimal modifications.
      >
      > At the time Cyclo was making their accessory SA sprocket sets SA was making 3 and 4 speed hubs and per the Cyclo data sheet link in the Links area they would fit both hubs.
      >
      > Rich Wood
      >
      >
      > --- In Geared_hub_bikes@yahoogroups.com, "palatine_ej" <danstrom@> wrote:
      > >
      > > No reason you couldn't weld up a custom dingle for the iM9. Hadn't thought of it until now. What cog pair would give a nice half step set-up?
      > >
      >
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