Buying a new chainring

Discussion in 'Cycling Equipment' started by procerus, Feb 9, 2004.

  1. procerus

    procerus New Member

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    I need to buy a replacement chainring. I want to order it online. Can anyone tell me how chainrings are sized in terms of fitting the crankset's arms?

    The site I'm buying from lists the sizes as "110mm PCD 5 Arm" and "130mm PCD 5 Arm" and so on. What does "PCD" refer to and how do I measure it?

    I'll reward any replies by asking further dumb questions as I continue the rebuild! :D
     
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  2. boudreaux

    boudreaux New Member

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    It's BCD, and it means Bolt Circle Diameter of the crankarm mounting bolts. It helps to know what cranks you have,but for measuring, with 5 hole crankarms,it's something like the distance between 2 non adjacent holes divided by .95.
     
  3. serenaslu

    serenaslu New Member

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    Here is an excerpt from Performance's website that may help

     
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