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Record Headset crown race mystery - problem

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Record Headset crown race mystery - problem

Old 07-19-16, 06:26 PM
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Spaghetti Legs 
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Record Headset crown race mystery - problem

OK started out on my next project on the list today which is change the Miche headset that came on my Tommasini frame to a Campy Record to match the other parts on the bike. The fork is a threaded Tommasini Air. The Miche came off really easy (a little too easy maybe?) and popped the crown race off in about 1 minute of work. Then the problems started.

The Campy crown race will slide onto the fork without needing to be pressed. It fits snugly, but I can spin it around by hand. I had originally thought the fork was Italian thread but turns out it's English and luckily I had an English thread Record in reserve. I dig that out and same thing!

I know the Italian standard has a 26.5 ID crown race as opposed to the standard 26.4, but I thought the Campy standard was 26.4 regardless of threading. What gives? I installed the Campy using the Miche crown race but when loaded, doesn't spin smoothly at all. Is it completely foolhardy to use the Campy crown race without a press fit?
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Old 07-19-16, 07:53 PM
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When I had to replace the headset on my Torpado the crown race was a major issue. Eventually had to have a circular 'shim' machined to take up the slack.


Maybe some Loctite???
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Old 07-19-16, 08:27 PM
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Check the diameter of both with a caliper.
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Old 07-19-16, 08:50 PM
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Campagnolo made a "go, no-go" gauge to check crown race seats:



You may need to knurl or use loctite, as suggested above to firmly seat your crown race.
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Old 07-19-16, 09:05 PM
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Originally Posted by JohnDThompson View Post
Campagnolo made a "go, no-go" gauge to check crown race seats:



You may need to knurl or use loctite, as suggested above to firmly seat your crown race.

Interesting - didn't have one in the Campag toolbox to which I once had access.


I hesitated to suggest knurling (or, worse yet, center punching all around), but it might be a reasonable solution if the difference in OD/ID isn't too great (and no, I don't know what 'too great' would be)
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Old 07-21-16, 10:44 AM
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Solved!

I made a shim from an aluminum can. When I re-removed the original Miche crown race, it was also noticeably loose. All three measured with an ID of 26.3_ mm.

I cut a strip from the can and secured it in place on the fork crown with a couple of drops of Loctite glue. Trimmed/filed the excess aluminum that got smushed down below the race and the remainder of the installation with smoothly.
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Old 07-21-16, 07:26 PM
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Aluminum is soft. I would check it fairly regularly for loosening.
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Old 07-22-16, 06:49 AM
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Originally Posted by rootboy View Post
Aluminum is soft. I would check it fairly regularly for loosening.
Thanks, I will but I figure for this application it should hold out pretty well.
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Old 07-22-16, 08:58 AM
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I guess it probably will.
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Old 07-23-16, 02:19 PM
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there's a loctite made specifically for this puprose; it's green, and made for press-fit when things don't fit exactly. i used it to take up .1 mm worth of space in a headset cup, and once set, it seems to be pretty sturdy. the added benefit is that it's also removable, in the sense that you only have to heat it up a bit to get it to loosen.
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Old 07-23-16, 11:01 PM
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Originally Posted by smoothness View Post
there's a loctite made specifically for this puprose; it's green, and made for press-fit when things don't fit exactly. i used it to take up .1 mm worth of space in a headset cup, and once set, it seems to be pretty sturdy. the added benefit is that it's also removable, in the sense that you only have to heat it up a bit to get it to loosen.
Thanks! Good to know, I didn't think the blue Loctite would work for a non threaded surface and definitely didn't want to use the red!
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Old 07-24-16, 04:19 AM
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Originally Posted by Spaghetti Legs View Post
Thanks! Good to know, I didn't think the blue Loctite would work for a non threaded surface and definitely didn't want to use the red!
All these years and it's only here I learn of the political leanings of Loctite. I'm shocked! UN
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Old 07-24-16, 07:03 AM
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Gotta go GREEN, Ed.
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Old 07-24-16, 08:01 AM
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Originally Posted by Ed. View Post
All these years and it's only here I learn of the political leanings of Loctite. I'm shocked! UN
Haha, Loctite me up!
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