Originally Posted by
dedhed
Verify your crown race and seat are both the same i.e. ISO and JIS diameters are different.
I had read about that and was fairly certain mine was ISO - it's a 1982 Holdsworth with an original Tange headset.
Fork measures 26.98
The removed crown race measures 26.8
The replacement (Tange Levin CDS) is 26.3
Rats, I'm guessing I need a JIS one.
Seems like this was known if I'd only looked:
https://forum.cyclinguk.org/viewtopic.php?t=17078
Update: Tange Levin CDS also comes as JIS, but not as common.