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Some time I'll be building a L'Eroica bike. I'm curious about the Campy Patent numbers assigned to components. Are they simply year of manufacture?
 

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Yes, if you're referring to the rear derailleurs. The codes on the cranks are more complex but also refer to production year. In general the Nuovo Record and the black body Super Record RD will be eroica eligible. You'll start pushing the limits with C Record stuff.
 
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