Thread: Help me choose a correct headset
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Old 06-21-13 | 08:38 AM
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JohnDThompson
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Originally Posted by TurboJ
About ISO sizing, what would that mean in millimeters? The usual information I see is crown race diameter, and obviously all the parts must fit to the head tube's inner diameter... But I guess that would be a standard diameter on '90s steel frames? Mine is 31.8 at the outside, but, I can't get the inner diameter just now.
ISO crown races have an ID of 26.4mm, OD of the cup flanges is 30.2mm
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