Thread: Old fork crown race inner diameter - what headset?
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Old 06-22-13 | 02:44 PM
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JohnDThompson
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Originally Posted by e2rider
So the crown seat should be milled to between 26.42 and 26.45 in order to produce the interference fit with a 26.4 ID race?
Yes. It needs to be just slightly larger than the ID of the crown race to make an effective interference fit. Campagnolo made a Go/No-go gauge to quickly assess the race seat:



Crown races crack when they're driven on crooked; some seem less tolerant of misalignment than others. We broke dozens of Super Record crown races at Trek, but I don't recall breaking a single Record crown race.
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