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Old 05-29-18, 10:09 AM
  #21  
fietsbob
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Location: NW,Oregon Coast
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R'off in a 26" wheel 38, 16, in a 20" wheel 53.16

My folding Brompton 16" .. 15t cog 54t chainring w gear box crank
effectively a 21.6t in low range ...
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