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  1. #1
    Senior Member leftthread's Avatar
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    Aug 2006
    Land of Cheese
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    JIS headset question

    I'm overhauling a 1973 Schwinn World Voyageur.
    The headset cups read 30.0 on a digital caliper; the fork crown race is 26.4.
    Most headsets I've looked at ship with 27.0 races combined with 30.0 cups.
    Can I substitute a 26.4 crown race from within the same manufacturer family?

    Say, this:

    with this?

  2. #2
    Andrew R Stewart Andrew R Stewart's Avatar
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    Feb 2012
    Rochester, NY
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    Maybe. Are the ball sizes the same for each race? How is the dimensioning of the race at it's base/seal fitting? There's a lot of class B fits out there but without actually trial fitting i wouldn't want to make any promises. Andy.

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