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PostPosted: Tue Oct 03, 2017 2:05 am 
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Joined: Mon Feb 25, 2013 4:32 pm
Posts: 49
Location: San Francisco, USA
A while ago I dissembled my 2012 Canyon Aeroad to send it in for repair. As I pulled the fork out the lower bottom bracket bearing cage disintegrated and I lost a few ball bearings.

I've looked all over for a replacement lower headset bearing but haven't been able to find anything. I even got into contact with Canyon to send me the exact replacement and even that was a totally incompatible part. I've looked for a bearing cage the same size but haven't been able to find anything.

Anyone have any ideas here? I think the races are totally reusable and that I just need new bearings and cage. I'm wondering if I could just use loose ball bearings packed with grease?

Here's my measurements:

Ball bearings: 3.13mm
28 bearings
Crown race outer (where bearings sit): 37.95mm
Crown race inner (fork steer diameter): 34.97mm
Headtube sleeve outer (sits in headtube): 49.01mm
Headtube sleeve inner (contacts the bearings): 43.63mm

I've attached some pics that will hopefully make it clear what I'm talking about.

Image

Image

Image


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Posted: Tue Oct 03, 2017 2:05 am 


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PostPosted: Tue Oct 03, 2017 2:51 am 
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Joined: Tue Jul 26, 2016 5:21 pm
Posts: 136
49mm OD x 35mm ID
How thick? Angular contact? Are you sure you don't have a spacer around the bearing?

Try looking for it by putting the ID first then the OD.

https://shop.acros.de/spare-parts/heads ... oad-cf-slx
http://www.ebay.co.uk/itm/CANYON-HEADSE ... wvSY7HG2Wg
If the Ebay ad is right http://www.airevelobearings.com/product ... et+bearing
https://www.kineticbikebearings.com/acb ... aring.html

Again? viewtopic.php?t=139828


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PostPosted: Tue Oct 03, 2017 3:46 am 
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Joined: Sat May 07, 2016 11:31 pm
Posts: 8
Get the size of the ball bearings and replace them without the retainers. You will probably need to add 2-3 balls to take up the extra space and use a thick waterproof grease to hold them in place during installation. Old timers will remember this is how you would get another season out of a Campagnolo headset back in the day.


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PostPosted: Tue Oct 03, 2017 5:58 pm 
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Location: San Francisco, USA
Quote:
How thick? Angular contact? Are you sure you don't have a spacer around the bearing?


How thick is what? The height of the whole assembly?

It's not angular contact like a typical sealed bearing would be. Definitely no spacer.

Quote:
https://shop.acros.de/spare-parts/heads ... oad-cf-slx
http://www.ebay.co.uk/itm/CANYON-HEADSE ... wvSY7HG2Wg
If the Ebay ad is right http://www.airevelobearings.com/product ... et+bearing
https://www.kineticbikebearings.com/acb ... aring.html


These match the one sent to me by Canyon.

Quote:
Again? viewtopic.php?t=139828


I forgot that I posted this topic last year. Still no resolution.

Quote:
Get the size of the ball bearings and replace them without the retainers. You will probably need to add 2-3 balls to take up the extra space and use a thick waterproof grease to hold them in place during installation.


Last night I tried this with the balls I have remaining. It installed fine but was unfortunately super rough. The surfaces of both races aren't perfectly smooth and I don't think they can be reused now.


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PostPosted: Tue Oct 03, 2017 6:19 pm 
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Joined: Wed Jan 10, 2007 10:56 pm
Posts: 1386
Location: Canada
The races appear to be "brinelled" or dented from the balls. Usually that's due to insufficient preload on the headset. So, when you do get a new bearing, make sure you've got enough preload. That means tightening down until the bar doesn't move when tilted to the side, and then back off 1/8 of a turn and check that it moves on its own.


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PostPosted: Tue Oct 03, 2017 7:06 pm 
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Joined: Fri Oct 28, 2011 3:25 am
Posts: 1462
Location: United Kingdom of Great Britain and Northern Ireland
You just buy a replacement headset and take the bearing from it.


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PostPosted: Tue Oct 03, 2017 8:08 pm 
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Joined: Tue Jul 26, 2016 5:21 pm
Posts: 136
There are a few different heights of the bearing - 35x49x (7 8 9mm??)
Also, are you sure you don't have a ring/cup on the OD or ID of the bearing? What does the assembled headset look like from the outside of the bike?


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PostPosted: Tue Oct 03, 2017 8:50 pm 
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Joined: Mon Feb 25, 2013 4:32 pm
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Location: San Francisco, USA
The assembled bearing is the upper cup sitting on top of the bearings which sit on the crown race.

I'll measure the height when I get home.


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Posted: Tue Oct 03, 2017 8:50 pm 


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PostPosted: Tue Oct 03, 2017 9:43 pm 
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Joined: Tue Jul 26, 2016 5:21 pm
Posts: 136
Also, rezero you gauge (I have that same one and it tends to lose zero) and get the ID of the race, I'll bet it's not 35mm. I'm guessing 37mm.


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