Thread: Gear ratio for touring with trailer
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Old 03-26-12, 11:15 AM
  #3  
fietsbob
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min gear of a 74 bcd chainring is 24t, can't be smaller than the bolt circle
that attaches it.
your crank has to have a 56 or 58 bcd granny gear mount for a 20t

Sram makes a cassette with a 34t or a 36t biggest cog, for the rear..
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