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Old 10-19-07, 11:47 PM
  #8  
fat_bike_nut
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Bikes: 2010 Surly LHT (main rider and do-everything bike), 2011 Bike Friday NWT (back-up bike and multi-modal)

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I dunno if it would work with a full size bike and mega-huge chainring combo, but the Shimano Capreo Cassette for folding bikes goes as low as NINE (9) Teeth. 68T/9T = insanely high

I'd think that you would need some monster quads to push that. Or help from gravity going down a hill...
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