How do you measure the diameter of holes on chainrings

daneworld
daneworld Posts: 6
edited September 2008 in Road general
Hi have a 52 tooth stronglight alloy chainring and need to know how to measure the bcd drillings please.
i have also got some vintage cycle parts and currently putting together a raleigh classic tourer from late 70s early 80s.
cheers mick.

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