Ritchey rim ERD for spoke length calc

Discussion in 'Cycling Equipment' started by Todd Holland, Apr 9, 2003.

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  1. Todd Holland

    Todd Holland Guest

    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.
     
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  2. 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.

    Peter Chisholm Vecchio's Bicicletteria 1833 Pearl St. Boulder, CO, 80302
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