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Reduce crown race seat diameter?

Old 07-03-12, 10:56 AM
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James1:17
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Reduce crown race seat diameter?

Okay so during the two weeks in '97 they made 1" threadless forks, they decided to use two different crown race diameter standards. Problem is, I didn't know this when I ordered my beautiful Ritchey WCS headset, and actually didn't even know it until I had already pressed the headset and tried to beat the race on the fork for a good half hour (thanks for the knowledge Dan). Guess what, I have a 27.0mm JIS fork and Ritchey only makes a 26.4 crown race.

So my question is this:

Without taking my fork to the machine shop or buying a new headset, is there a viable way to reduce the diameter at home? I was thinking about wrapping some fine grit sandpaper around it and turning with my free hand to get an even finish. I don't really want to reduce the inner diameter of the race for fear of it not meeting the lower angular bearings in the right place.

Thoughts? Thanks in advance.

*edit: it's a carbon fork with steel steerer tube, but the surface needing resizing is alloy

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Old 07-03-12, 10:59 AM
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Any bike shop will have a cutter specifically for reducing JIS crown races to ISO diameter and it's a relativly low cost job. Have it done right.
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Old 07-03-12, 11:03 AM
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Oh awesome. So they'll cut the crown race, or the seating area on the fork?
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Old 07-03-12, 11:15 AM
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Originally Posted by James1:17 View Post
Oh awesome. So they'll cut the crown race, or the seating area on the fork?
They will cut the seating area on the fork and it's a one-time job. After that, any ISO crown race will fit it.
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Old 07-03-12, 06:20 PM
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Thanks for the info HR. The third shop I tried had the tool. 15 bones later, and my a-bike is finally on its way to being a bike again. Appreciate it!
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