Thread: Help calculating differences with changing cogs
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Old 05-15-15 | 07:09 PM
  #11  
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dave42
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From: E TN MTS

Bikes: 1989 TREK 400, Suntour accushift drivetrain. 80's Raleigh mtb all Suntour.

I like this one real good... Sheldon Brown's Bicycle Gear Calculator
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