crown race dimension of an older miyata
06-10-09, 05:02 AM
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crown race dimension of an older miyata
I've got what I'm pretty sure (checked catalogs) is a 1990 Miyata triplecross. I'd like to replace the headset, but I am wondering what the diameter of the crown race is. Anyone know? Thanks!
06-10-09, 06:59 AM
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My guess is 27.0mm. Have you looked at the bottom of the crown race on there now? They're are often stamped with the size.
Neal
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06-10-09, 07:41 AM
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By 1990, even most Japanese bikes used ISO 26.4mm crown race seats. Even if yours happens to be JIS 27.0mm, it's trivial to mill the race seat down to ISO dimensions for a new headset.
06-10-09, 04:46 PM
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Unfortunately, there was no stamped diameter on the race. The race seat also had paint on it, so calipers were not very accurate.
