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Wheelbuilding - ERD question

  • 23-01-2014 3:34pm
    #1
    Alek
    Registered Users, Registered Users 2 Posts: 4,520 ✭✭✭


    I will need to rebuild my front wheel shortly. The ERD of the current rim (Mach 1 Omega - quite difficult to find) is 592mm.

    Am I correct thinking that there is some leeway in the ERD diameter if I want to reuse the spokes and nipples?

    In example, if the new ERD will be 596mm, the spokes will have 2mm thread left exposed at the nipple? (596mm-592mm = 4mm, 2mm each side).

    Is it safe to do so?


    The wheel is relatively new (4500k) but had once braking surface not-so-mysteriously* worn off... with 32 spokes, they seem to be in good condition.

    * - the skewer was too loose on a few rides and the wheel kept rubbing slightly on the brake pad. My fork has no lawyer's lips so I am happy I'm still alive ;-)


Comments

  • #2
    joxerjohn
    Registered Users, Registered Users 2 Posts: 396 ✭✭joxerjohn


    I saw those Mach 1 rims on Ebay recently quite good value. It would be best to replace with the same Mach 1 Rim in that way no problems with the spoke length. I think 4 mm is quite a bit you could probably get away with 2m i.e 1 mm each side but 4mm might be pushing it.

    Might be worth contact Humphries in Finglas who are very helpful in all things wheel building.


  • #3
    cdaly_
    Registered Users, Registered Users 2 Posts: 6,440 ✭✭✭cdaly_


    I'm guessing you could replace 14mm nipples with 16mm to accommodate a 4mm larger ERD but, be aware that a larger ERD means less spoke threads holding the tension and so a possibly greater risk of failure...


  • #4
    kumate_champ07
    Closed Accounts Posts: 7,150 ✭✭✭kumate_champ07


    cdaly_ wrote: »
    I'm guessing you could replace 14mm nipples with 16mm to accommodate a 4mm larger ERD but, be aware that a larger ERD means less spoke threads holding the tension and so a possibly greater risk of failure...

    longer nipples dont have extra threads, they just have a longer area for use with deep rims for the nipple spanner to hold onto

    2mm difference is fine if its a 32/36h wheel, maybe ok for 28h


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