Thread: What makes a chainring 'compact'?
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Old 05-13-15 | 04:13 PM
  #20  
bradtx
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Originally Posted by RandomTroll
Some chainrings are described as 'compact'; what does that mean? thinner?
Basically means that the chain ring fits a crank set with a smaller Bolt Circle Diameter (BCD) rather than the manufacturer's standard size. For Shimano's compact is 110 mm, standard 130. Campagnolo is, I think, 94 mm compact and 135 mm standard.

Brad
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