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Old 05-06-10, 06:27 PM   #1
invisiblehand
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Another internally geared crank

http://www.bikerumor.com/2010/04/26/...for-commuters/

It isn't clear to me whether one can swap the chainrings. But given the cost of a Schlumpf Drive, an alternative is a plus.
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Old 05-06-10, 07:23 PM   #2
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Good development. I am a little leery of small chainrings, which wear quicker. Ability to swap out rings would be essential.
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Old 05-06-10, 10:00 PM   #3
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I'm willing to bet the chainring is replaceable. I t also looks like an external mechanism, as opposed to the schlumph which I believe houses the mechanism within the BB (feel free to correct me here).
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Old 05-06-10, 10:09 PM   #4
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The Schlumpf's actual planetary gear mech and clutch is also external but some of the gear change parts are inside the spindle.
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Old 05-06-10, 10:58 PM   #5
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Interesting - perhaps it could also work with larger rings :
e.g. 35 * 1 / 1.6 -> 35 / 56 - giving a really wide range to small wheeled bikes.
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