wheel build Q – fitting new rim – how close does the ERD need to be?

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  • wheel build Q – fitting new rim – how close does the ERD need to be?
  • reggiegasket
    Member

    I want to replace a rim on my commuter. It’s a Stans Crest 29er with an ERD of 605.

    How close does the ERD of the new rim need to be for me to still be able to use the existing spokes?

    For example, a Velocity A23 rim is 601 – would that be okay?

    Premier Icon wwaswas
    Subscriber

    4mm is quite a lot – you *may* get away with switchign to 12mm nipples if you currently have 14’s fitted but I think you may find nipples bottoming out on the spoke threads if you keep spokes and nipples.

    reggiegasket
    Member

    Ta. Is 605 the diameter of the ‘wheel’ then, in mm?

    So a 601ERD needs spokes that are 2mm shorter than a 605ERD (basically)?

    Premier Icon rob
    Subscriber

    Yes 2mm difference in spoke length between the rims
    I would reuse your spokes should be ok

    Ta. Is 605 the diameter of the ‘wheel’ then, in mm?

    as ERD = Effective Rim Diameter, yes.

    Some maufacturers use a different standard, IIRC Mavic’s ERD are ~3mm out compared to other companies way of measuring.

    from http://www.bikeforest.com/CAD/wheelCAD.html

    Mavic supplies the spoke support diameter of all of their rims at there website: http://www.mavic.com. The Bicycle Forest has added 3mm to these values to arrive at the effective rim diameter.

    gmanfox
    Member

    would this work the other way??? say going from an erd of 530 to 533

    Dickyboy
    Member

    say going from an erd of 530 to 533

    prob not as only 1.5mm difference but check & see if you can tell how far into your nipples the spokes already run – right into the head & you will be good to go no problem

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