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  1. #1
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    ERD for Weinmann 2120 650B rims?

    Does anyone know the ERD of old Weinmann 2120 650B rims?

    I scored a set of 650B wheels off an old Schwinn Mirada, and I'm thinking about rebuilding the rear with a cassette hub. I can't find any reference to the rim specs, and I guess I'll eventually have to measure the ERD myself, but it would be good to have a number to compare to my measurement. And I'd like to avoid removing the original Schwinn 40-584 tires - I can probably still ride them for awhile, but the gum sidewalls are a bit crackly.

    Thanks,

    tcpasley

    Reduce, Reuse, Rebicycle

  2. #2
    Nigel nfmisso's Avatar
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    measure.

    how do you expect to put the rim on a different hub without removing the tires????
    Nigel
    Mechanical Design Engineer

  3. #3
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    Quote Originally Posted by nfmisso View Post
    measure.

    how do you expect to put the rim on a different hub without removing the tires????
    I said "thinking about rebuilding". I'd like to spec a hub, DS and non-DS spokes and start looking for bargains while I wear out the original tires. Of course I'd have to take the tires off to replace the hub.

    tcpasley

  4. #4
    Nigel nfmisso's Avatar
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    If you have a pretty good idea of the nipples on the spokes, you can measure from the center of the axle to the point where the spoke enters the nipple, and add the length of the end of the nipple to its flange.
    Nigel
    Mechanical Design Engineer

  5. #5
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    I measured it (circumference around spoke heads /pi). I got about 574mm ERD for the Weinmann 2120 650B rim. With a Tiagra FH-4500 rear hub, the lenni.info/edd/ spoke calculators says I'll need ~276mm spokes DS, ~278mm NDS.

    tcpasley

    Reduce, Reuse, Rebicycle

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