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Head set replacement question

Old 05-17-24, 04:32 PM
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Head set replacement question

I have a 1979 Trek 736.
The bike came with different parts : Shimano 600, Dura-ace and Campagnolo, and I try to replace the non-original parts with the Shimano 600 Arabesque.
The actual headset is Campagnolo.
When I tried to replace the fork crown race, the Shimano has the interior diameter (26.8mm), and is bigger than that Campagnolo (26.3mm).
I tried other crown races (Tange and no name), and these are bigger too.
What's the solution/ problem here?
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Last edited by marius.suiram; 05-17-24 at 08:04 PM.
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Old 05-18-24, 02:27 AM
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https://www.sheldonbrown.com/cribsheet-headsets.html

Best you measure the cup and seat diameters as well.
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Old 05-18-24, 03:13 AM
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Originally Posted by oneclick
https://www.sheldonbrown.com/cribsheet-headsets.html

Best you measure the cup and seat diameters as well.
Does it means that the fork takes only a Campagnolo head set?
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Old 05-18-24, 05:00 AM
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Did you remove the current Campy fork crown race and take an accurate measurement of the fork crown seat? Is it ~26.4mm? Did you test the Shimano fork crown race? Just curious.
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Old 05-18-24, 06:53 AM
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Originally Posted by masi61
Did you remove the current Campy fork crown race and take an accurate measurement of the fork crown seat? Is it ~26.4mm? Did you test the Shimano fork crown race? Just curious.
Yes, I removed the Campi crown race and measured, ~26.3mm
I measured the Shimano crown fork, 26.8mm.
The Campi was pressed on the fork, the Shimano is moving free.
I will measure the fork seat, but will be probably around 26.4mm
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Old 05-18-24, 06:59 AM
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Originally Posted by marius.suiram
Yes, I removed the Campi crown race and measured, ~26.3mm
I measured the Shimano crown fork, 26.8mm.
The Campi was pressed on the fork, the Shimano is moving free.
I will measure the fork seat, but will be probably around 26.4mm
After you measure the fork seat I would slip the Shimano crown race on there just to check. It may work, maybe just would not need to be tapped down as much. Or it could be that your Shimano headset is the one for a 30.0 crown seat. Do you have a metric caliper accurate down to 0.1mm? This might come in handy here.
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Old 05-18-24, 07:42 AM
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Originally Posted by marius.suiram
Yes, I removed the Campi crown race and measured, ~26.3mm
I measured the Shimano crown fork, 26.8mm.
The Campi was pressed on the fork, the Shimano is moving free.
I will measure the fork seat, but will be probably around 26.4mm
Some diligence on the interwebs may turn up a shiman 26.4 race but unless there is something wrong with it I’d just reuse the Campagnolo headset.

the only other option would be have a frame builder add some materiel to the seat and the remill to the larger size.
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Old 05-18-24, 10:21 AM
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Originally Posted by marius.suiram
Does it means that the fork takes only a Campagnolo head set?
The Campagnolo dimensions are what became the ISO specification, so any ISO-spec headset of the same or shorter stack height should work. The Shimano headset is likely JIS-spec. Most Tange headsets can be had in either ISO or JIS spec.
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Old 05-18-24, 07:10 PM
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The fork seat is 26.4 mm
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Old 05-22-24, 03:25 PM
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I found a replacement: Stronglight
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Old 05-22-24, 04:10 PM
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Originally Posted by marius.suiram
I found a replacement: Stronglight
Well done on succeeding despite our best efforts to confuse. There are plenty of options with 26.4 crown race. I had a Shimano 600 at one time with a 26.4 but more commonly found in 27
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Old 05-22-24, 04:18 PM
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Originally Posted by JohnDThompson
Most Tange headsets can be had in either ISO or JIS spec.
My bike shop has just the crown race in both sizes. I was impressed when I found out Tange supplied them separately.
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