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Old 04-28-20 | 12:11 PM
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ham_sandwich
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Joined: Apr 2020
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Headtube ID tolerance?

Hi all,

This isn't strictly related to my framebuilding, but thought I'd ask here as there's probably more expertise than on most other forums..

I've acquired a brand new frame (not mentioning manufacturer for now) and I'm not sure whether to be concerned by the headtube (standard 1 1/8ths) being slightly out of round / ovalised.

Along the plane of the frame (so along top tube), the ID of the top of the headtube is 34.1mm. At right angles to this, it's 33.6. So it's a bit off. Am I right in thinking this is unacceptable..? Headtubes are usually reamed to more like 33.8mm, right? So with a headtube that's 34.1 in one direction, the headset is always going to be a loose fit here, no matter what I do?

Measured at the bottom of the headtube, it's more like 33.90 and 33.65mm.

Thanks!
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