Bike Forums - View Single Post - Are headset races available in "undersize" ID?

07-19-11 | 10:39 PM

#5

Jeff Wills

Insane Bicycle Mechanic

Joined: Mar 2008

Posts: 10,163

Likes: 1,128

From: other Vancouver

Quote:

Originally Posted by abarth

ISO crown race ID is 26.4mm = 1.039"
JIS crown race ID is 27.0mm = 1.063"

So pick one.

I agree. The alternative I would choose is to take the fork to a well-equipped shop and have the fork crown race seat machined down to fit an ISO crown race. You'll just have to remember that you have a hybrid headset, though, unless you have the headtube reamed and faced for an ISO headset.

Good cheat sheet: http://www.sheldonbrown.com/cribsheet-headsets.html

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Jeff Wills

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