Thread: Double chain ring vs. compact
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Old 04-07-10 | 09:59 PM
  #3  
Al1943
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Joined: Feb 2005
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From: Oklahoma

Bikes: Trek 5500, Colnago C-50

The BCD Bolt Circle Diameter for most modern cranksets, including Shimano are 130 mm. Compact cranksets have a 110 mm BCD and can accept smaller chainrings. Campagnolo standard cranksets have a 135 BCD.
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