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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 01-19-07, 08:54 PM   #1
dannl
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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?
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Old 01-21-07, 08:18 AM   #2
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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.
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Old 01-21-07, 09:52 AM   #3
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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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