Ritchey rim ERD for spoke length calc

What is the correct ERD for Ritchey WCS Aero (front) and OCR (rear) 700c rims? The excellent
"spocalc.xls" by Damon Rinard lists 606mm, but a note says "spoke seat 602mm." I used the straight
number for Ritchey 26" rims and the spokes were a tad long, so I suspect 602mm is correct.

Also, do I need to account for the 3mm offset of the spoke holes on the OCR rear rim by changing the
flange-to-center distances for the hub? Or is this offset too small to affect spoke length?

Any help would be appreciated (Campy 9v hubs, 28h 3x), Todd H.

 

tholland-<< so I suspect 602mm is correct.

Agree but I'm at home and my ERD list is at work-you can call..

<< Also, do I need to account for the 3mm offset of the spoke holes on the OCR rear rim by changing
the flange-to-center distances for the hub?

Use the same flange measurements, i just add 1mm to the left spoke length instead of
2mm...build normally.

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