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  1. #1
    Bikaholic blamp28's Avatar
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    ERD for older rim

    I acquired a rim from my Brother in law the other day for use on a Tandem rear wheel build. It is a Sun 40 hole Chinook with a wheel smith decal on it but no other markings or numbers. It is in great shape but when I contact Sun/Ringle for the ERD, they have no specs on the older Sun stuff. Does anyone know how i can get this ERD so I can calculate the spoke length? Thanks in advance!
    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

  2. #2
    Decrepit Member Scooper's Avatar
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    - Stan

  3. #3
    Senior Member Retro Grouch's Avatar
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    Quote Originally Posted by Scooper View Post
    Measure it
    Cut the elbows off of two spokes so they are exactly 250mm long. Locktite nipples to each spoke such that the end of the spoke exactly matches the end of the nipple.

    Now insert the two truncated spokes in opposite holes in the rim. Measure the distance between the truncated spoke ends to get ERD.

  4. #4
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    Quote Originally Posted by Retro Grouch View Post
    Cut the elbows off of two spokes so they are exactly 250mm long. Locktite nipples to each spoke such that the end of the spoke exactly matches the end of the nipple.
    I've seen the exactly same recommendation but the cut spokes were to be threaded into the nipples until they came exactly to the bottom of the screwdriver slot in the nipple head.

  5. #5
    Decrepit Member Scooper's Avatar
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    Quote Originally Posted by HillRider View Post
    I've seen the exactly same recommendation but the cut spokes were to be threaded into the nipples until they came exactly to the bottom of the screwdriver slot in the nipple head.
    Yes; that is wheelbuilder Roger Musson's advice:

    - Stan

  6. #6
    Bikaholic blamp28's Avatar
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    Cool. I was hoping for answers like these. This is very helpful. Thanks!
    Trek Fuel XC MTB, Giant OCR Road Bike, Rans Screamer - Tandem

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