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Thread: top cap size

  1. #1
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    top cap size

    Hi all,

    I took my frame to the bike shop for threadless headset installation but, having no stem yet, I told them to leave the steerer uncut. I got the frame back and they gave me a different top-cap and star nut than the one I gave them. The steerer is 1", what should the diameter of the top-cap be? Will some top-caps only fit well with certain stems?

  2. #2
    Senior Member capwater's Avatar
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    Most stems run 1 1/8 so you need to use a shim. Thus, your top cap would also need to be the 1 1/8 inch model. Not sure what your wrench's logic was, but this could be one explanation.

  3. #3
    Senior Member Retro Grouch's Avatar
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    I agree with capwater. Also, if your fork has a carbon steerer, you need to use a compression plug rather than a star nut.

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