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Old 11-24-10, 03:35 PM
  #19  
fietsbob
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2 planetary.. Schlumpf makes a planetary 2 speed crank set.
3 types 2 overdrive and one reduction gear
They combine with a 3 speed to offer 6 ratios, ... over/reduction by 2.5 .. or 1.6x overdrive.
Swiss Made , so snow is part of the environment..

current clutch in them is fixed gear capable, so you can
run the cog set small for the low ratios ,
tap the button in the center of the crank arm and it multiplies that ratio
by say by 2,5 for the high speed drive
example: say 1:1 low, 27'', wheel size with both sprockets the same size, high = 67.5,
or a multiple of 1.6 which he calls the speed drive

Still a single speed chainline

Last edited by fietsbob; 11-24-10 at 03:50 PM.
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