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Pairing a Rohloff with a Schlumpf High Speed Drive

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  • gordonKoppang
    Jim s Fargo was a custom made quadracycle built by Utah Trikes. The Fargo used a Rohloff hub and a Schlumpf High Speed Drive with a 27t sprocket. If I
    Message 1 of 2 , Feb 10, 2012
      "Jim's Fargo" was a custom made quadracycle built by Utah Trikes. The Fargo used a Rohloff hub and a Schlumpf High Speed Drive with a 27t sprocket. If I remember correctly, the smallest sprocket you can fit to a Rohloff and stay within the mandated sprocket ratio is 32t. The vehicle was heavy to start with, and Jim was pulling a trailer and climbing steep hills. To make a long story short, Jim sheered the nylon pins in the Rohloff. You can read more here:

      http://www.utahtrikes.com/RECENTTRIKE-Jims_Fargo.html

      And here…

      http://cyclingexperiences.com/2010/06/16/my-cycling-experiences-on-tour-day-03-mechanical-2-3/

      GK
    • Cycle Monkey
      Rohloff guarantees that their hubs will work properly if the primary ratio does not fall below 2.35 for standard riders or 2.5 for tandems or riders over
      Message 2 of 2 , Feb 11, 2012
        Rohloff guarantees that their hubs will work properly if the primary ratio does not fall below 2.35 for standard riders or 2.5 for tandems or riders over 100kg/221 lbs.  This equates to 38T and 40T chainrings, respectively, when using the stock 16T sprocket.  This quad would fall into the 2.5 ratio category; the 27T HSD sprocket was way too small (1.69 ratio) for such a heavy vehicle.

        Neil



        On Fri, Feb 10, 2012 at 11:31 PM, gordonKoppang <gordonkoppang@...> wrote:
         



        "Jim's Fargo" was a custom made quadracycle built by Utah Trikes. The Fargo used a Rohloff hub and a Schlumpf High Speed Drive with a 27t sprocket. If I remember correctly, the smallest sprocket you can fit to a Rohloff and stay within the mandated sprocket ratio is 32t. The vehicle was heavy to start with, and Jim was pulling a trailer and climbing steep hills. To make a long story short, Jim sheered the nylon pins in the Rohloff. You can read more here:

        http://www.utahtrikes.com/RECENTTRIKE-Jims_Fargo.html

        And here…

        http://cyclingexperiences.com/2010/06/16/my-cycling-experiences-on-tour-day-03-mechanical-2-3/

        GK




        --
        Neil Flock
        Owner

        Cycle Monkey
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