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Old 03-11-11, 11:15 AM   #1
Re-Cycle
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Does a 1" columbus headset exist? Getting a 1" threadless fork on a ~ 2003 raleigh

So I'm in a predicament where my lack of non standard headsets is keeping my build from moving forward.

The condensed version is that I wanted to build myself a new road bike around a 2003 raleigh professional frame which I've had sitting around for a few years. It's a nice columbus steel frame but the trouble is that the headset interface is unfamiliar to me. It appeared to use a standard integrated headset but when I tried to drop in a Cane Creek IS2 headset the bearings floated all around the frame with room to spare. From the googling I've done it seems the frame actually uses a columbus IS headset. Great. So The problem is I've got myself set on using a 1" Look HSC fork that was floating around the parts bin and I can't find a 1" columbus headset.

Anyone want to trade me forks?
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Old 03-11-11, 11:45 AM   #2
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Here is Park's article on headsets. Scan down to the description of the Columbus system:
http://www.parktool.com/blog/repair-...dset-standards

Here is a source for the FSA version of the Columbus headset:
http://www.cycle-frames.com/bicycle-...45-DEGREE.html

As best I can tell, they are all 1-1/8" headsets so your 1" fork won't work.
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Old 03-11-11, 11:57 AM   #3
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Unfortunately I think you are right. All I really need are some bearing that have the columbus OD and the 1" headset ID for the crown race and top cap etc.

[or my fork swap idea]
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Old 03-11-11, 12:10 PM   #4
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Your best bet may be adapting your 1" fork to accept a 1-1/8" headset.

I don't know if anybody makes these, but you can look around. You need a stepped adapter for the crown with a 26.0 ID, and 30.05 OD. For the upper end you need a simple split sleeve 1" ID, 1-1/8" OD about an inch long, and a series of 1" spacers with the same OD as typical 1-1/8" ones to make sure they engage the headests centering cone properly.

I think that sometime back these were production items for someplace, but if not, you'll have to find a friend with a lathe because paying a machine shop to make them would be prohibitive.
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Old 03-11-11, 12:41 PM   #5
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Quote:
Originally Posted by FBinNY View Post
Your best bet may be adapting your 1" fork to accept a 1-1/8" headset.

I don't know if anybody makes these, but you can look around. You need a stepped adapter for the crown with a 26.0 ID, and 30.05 OD. For the upper end you need a simple split sleeve 1" ID, 1-1/8" OD about an inch long, and a series of 1" spacers with the same OD as typical 1-1/8" ones to make sure they engage the headests centering cone properly.

I think that sometime back these were production items for someplace, but if not, you'll have to find a friend with a lathe because paying a machine shop to make them would be prohibitive.
Probably an easier way to make the 1-1/8" crown race fit would be to make a short bushing as you specified and use a 1" crown race setter to drive it into place and then set the 1-1/8" crown race on it. BTW. wouldn't the ID be 26.30 or 26.35 mm to be a snug fit on a 26.4 mm crown race seat?
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Old 03-11-11, 12:45 PM   #6
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Quote:
Originally Posted by HillRider View Post
Probably an easier way to make the 1-1/8" crown race fit would be to make a short bushing as you specified and use a 1" crown race setter to drive it into place and then set the 1-1/8" crown race on it. BTW. wouldn't the ID be 26.30 or 26.35 mm to be a snug fit on a 26.4 mm crown race seat?
Yes, that's exactly what I had in mind. the 26.0 dimension was a typo, I meant 26.4. You don't have to make it undersized because in normal conditions the crown race is at the nominal and the fork's crown seat is a bit over for interference. Making the ID under would be excessively tight.

Note that the adapter race needs a flange at the bottom, because you can depend on the flat seat on the fork being wide enough.

BTW- I used to have 1" adapter crowns for Cane Creek 1-1/8" headsets. If the Columbus crown race (actually centering cone) is similar, I can check to see if I still do. That and a Thomson 1" adapter and the OP could be set.
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Last edited by FBinNY; 03-11-11 at 12:48 PM.
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Old 03-11-11, 01:16 PM   #7
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Thanks for the offer, I already have a 1" stem adapter as I plan on using a 1 1/8" stem but adapting the 1 1/8" headset to the 1" fork is really what I'm up against.

It would seem to me that the crown race adapter would need a lip so the weight of the bike/rider bears down on the adapter and that the race is actually not directly touching the fork. Is that how they work or are these adapters purely a straight sleeve.

PM me if you have two of said adapters FBinNY, I'd happily send you some CA sunshine [or equal trade parts/$]
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Old 03-11-11, 01:32 PM   #8
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If you can accurately measure the Bore in the frame, there is bound to be a bearing
[best: angular contact type , wouldn't use a radial contact type..]
with a 1" ID , and an appropriate thickness by going to a bearing supply specialist,
industrial , not necessarily the Bike Biz.
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Old 03-11-11, 04:55 PM   #9
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Quote:
Originally Posted by Re-Cycle View Post
Thanks for the offer, I already have a 1" stem adapter as I plan on using a 1 1/8" stem but adapting the 1 1/8" headset to the 1" fork is really what I'm up against.

It would seem to me that the crown race adapter would need a lip so the weight of the bike/rider bears down on the adapter and that the race is actually not directly touching the fork. Is that how they work or are these adapters purely a straight sleeve.

PM me if you have two of said adapters FBinNY, I'd happily send you some CA sunshine [or equal trade parts/$]
I couldn't find any of them in my stash, and today was too busy to follow up. If you haven't come up with anything over the weekend I'll phone my contact at Cane Creek, and ask him if he has any in his desk drawer.

BTW- I figured out how make the crown adapter without needing a lathe. You'll need a standard 1" crown centering cone (not an actual bearing race for loos ball HS) to sacrifice, and a short piece of your stem adapter. Don't forget that if you're using a 1-1/8" stem you need 2 adapters. One for the centering cone, and one for the stem.

Let me know if you're game, and I help you walk through it. Otherwise I'll spare my fingers the work.
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