Originally Posted by
Zaphod Beeblebrox
That darn Sheldon Brown article about headsets led me horribly astray when attempting to fit a new headset for my Team Miyata.
What tripped me up in that Chart in that article is that the listing for "ISO" says that its got a 26.4mm crown race and 30.2mm Cups.
What it neglects to mention is that you can also get a headset with 30.2mm cups and a 27.0 mm crown race. (example: Tange Levin CDS)
What it comes down to is if your bike takes 30.2mm cups, you need to measure the crown race to see if its 26.4 or 27.0. It could be either.
Exactly and this is what I've been preaching for years.
JIS: 30.0 cups
ISO/Standard: 30.2 cups.
Both JIS and ISO/Standard headset are/were avaialble with 26.4 or 27.0 fork races. Period.