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Magic Gear Calculator

The magic gear calculator lets you find possible chainring and cog combinations for a single speed bike with vertical dropouts without the need for a chain tensioner.

  1. Enter chainstay length (in mm)
  2. Pick an allowable slack percentage (% of one link)
  3. Pick chainring and cog size ranges
  4. The list bellow shows all possible options sorted by ratio

http://arirobinson.ca/MagicGear.html

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