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PostPosted: Tue Nov 24, 2020 3:05 pm 
Newbie

Joined: Tue Nov 24, 2020 2:52 pm
Posts: 3
Hello,

New member here.

I'm building a bike with a classic Carlton (27in wheels) steel frame.
The fork is a standard threaded. I'm trying to fit a headset but the crown race is a bit loose. I measured the crown to be 26.3mm, I don't think this was ever a standard.

Is there a way to fit the crown race in thses situations? Maybe using an anaerobic compound?


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PostPosted: Tue Nov 24, 2020 6:00 pm 
Old School Grand Master
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Joined: Fri Oct 14, 2011 8:41 pm
Posts: 10040
Location: Cumbria
Check with another ISO crown race if possible to check the one you have is not rogue. BITD we used to punch a series of "holes" with a centre punch around the bearing area of the fork crown to rise rings of metal which helped retain the crown race.


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 Post subject: Re:
PostPosted: Tue Nov 24, 2020 6:19 pm 
Newbie

Joined: Tue Nov 24, 2020 2:52 pm
Posts: 3
I've tried with 2 races. It's definitely the crown which is too small, maybe worn?
The punch method seems a bit brute force but could work I guess.


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 Post subject: Re:
PostPosted: Fri Nov 27, 2020 11:56 am 
Dirt Disciple

Joined: Wed Aug 26, 2020 9:39 pm
Posts: 60
Punching the crown seat was what we used to do as well. Works as long as the race isn't too loose a fit.


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PostPosted: Fri Nov 27, 2020 3:52 pm 
Newbie

Joined: Tue Nov 24, 2020 2:52 pm
Posts: 3
I have some retaining compound (Loctite 641). It seems to hold the crown race tight in place. I'm going to test for a week or two to see if it holds.


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PostPosted: Fri Nov 27, 2020 6:03 pm 
Old School Grand Master

Joined: Mon Feb 11, 2008 9:42 am
Posts: 3678
Do you have a JIS 1" headset on there?

Just worth checking......


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 Post subject: Re:
PostPosted: Fri Nov 27, 2020 6:32 pm 
Retro Guru
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Joined: Tue May 11, 2010 6:39 pm
Posts: 1815
Location: South Devon
I've found that a loose-ish crown race can be OK in practice - on a previous build I just went with it (slid it in place and installed the headset) and I found that after quite a few miles of riding (i.e. having worn out the chain) the headset remained tight and correctly adjusted without undue wear.

Too tight is more of a pain. I've damaged quite a few crown races attempting to fit to a slightly too big crown.

I reckon it'll be fine with the loctite - I wouldn't worry about it unless the headset works loose or similar.


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 Post subject: Re:
PostPosted: Thu Dec 03, 2020 9:00 pm 
Dirt Disciple

Joined: Tue Apr 28, 2020 9:38 am
Posts: 69
26.3 is pretty close to 26.4, which is the ISO standard... It's easy enough to be 0.1mm out when you're eyeballing it...

https://www.sheldonbrown.com/cribsheet-headsets.html


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