Paint Crack or Carbon Crack

Discuss light weight issues concerning road bikes & parts.
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ALAN Carbon+
Posts: 250
Joined: Mon Dec 26, 2005 9:21 am
Location: Canberra, Australia

by ALAN Carbon+

I recently noticed a crack near the headtube of my 2012 Lapierre Xelius. I spoke to the shop that I bought the frame (new old stock) from in 2014 and sent some photos to them as they are interstate.

The shop passed the photos on to the Australian distributor who said they would consult with Lapierre about the frame. Lapierre believe that it is only a paint crack and only covered by a 12 month warranty.

When I was in my local shop recently, I mentioned the crack to them and they inspected the frame. They were concerned about the crack, particularly given the location of the crack near the head tube and cable guides for the internal routing. They also deal with the Lapierre distributor, but for other brands in their portfolio.

I would appreciate other thoughts on whether they think it is just a paint crack as Lapierre believe or something more. My gut feel is it worth having the frame looked at further as I now have some doubt in my mind about the frame.
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xelius crack.jpg

bikemaniack
Posts: 376
Joined: Thu Jul 16, 2009 9:33 pm

by bikemaniack

In my opinion it's a paint crack,but in strange place. It was a normal thing in older Specilaized MTB frames:)

bad thing is.that it finish on black decal,so we dont know how long it is. But its easy to fix.

by Weenie


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kgt
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Joined: Sun Jun 18, 2006 10:29 am
Location: Athens, Greece

by kgt

IMHO it is not just a paint crack but I also trust Lapierre. If it becomes bigger then I would seriously worry.

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hatsunagi
Posts: 25
Joined: Sat May 13, 2017 4:29 am

by hatsunagi

It looks like a paint crack.
Put a drop of water on it and if it flows into the (supposed) crack,it would be real carbon crack...

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jfranci3
Posts: 326
Joined: Tue Jul 26, 2016 5:21 pm

by jfranci3

Pull the cable port out and see if you can see anything from the other side. You might need an inspection cam and you still might not be able to get an angle on it. Is there a cable port on the other side?

totalcompactroad
Posts: 32
Joined: Tue Jan 31, 2017 11:12 pm

by totalcompactroad

i would say paint but its odd as it echoes the shape of the cable guide

definately worth further inspection

AJS914
Posts: 2251
Joined: Tue Jan 28, 2014 6:52 pm

by AJS914

Tap it with a coin on and around the spot to see if the sound changes. If the sound goes dead or changes to a lower tone when you are tapping on the crack then it's more than a paint crack.

FIJIGabe
Posts: 1513
Joined: Tue Sep 11, 2012 6:07 pm
Location: The Lone Star State

by FIJIGabe

It looks like a paint crack, but I would recommend you listen to the CyclingTips podcast from Feb. 19. They interviewed Raoul Luescher from http://luescherteknik.com.au/, who talked about his technique for scanning CF. I've got no connection to them, but since you're in Australia, it may be worth a look, for peace of mind.
Madone 9 https://goo.gl/7UwZpV
Crockett https://goo.gl/f5PdCN
Madone 5 https://goo.gl/cMdyFo

Madone 4, Cobia. I own a lot of Treks.

wilwil
Posts: 216
Joined: Thu Sep 23, 2010 5:47 pm

by wilwil

Looks like a carbon crack to me. The paint will only crack if what its applied to has cracked. Paint can scratch, obviously, but that doesn't look like a scratch. I had a crack on a brand new C60 on the head tube, it looked like a scratch at first sight but a microscopic picture proved otherwise. Been waiting weeks for Colnago to sort it out. :-(

jfranci3
Posts: 326
Joined: Tue Jul 26, 2016 5:21 pm

by jfranci3

Looking at it again, it looks like the cable grommet is attached on the outside of the structure, under the paint. I bet they do structual layups, attached the grommet, and then put the finish layer on. That or the grommet is glued onto the top and blended in with some goo. The crack is probably nothing to be worried about given the C shape, a structural crack would be a line in a given direction.

Svetty
Posts: 512
Joined: Thu Mar 26, 2009 11:06 pm
Location: Yorkshire - God's Own Country

by Svetty

White paint is more prone to cracking than other colours I'm lead to believe. I'd also do the 'coin test' but it looks more like a paint crack to me.....

fogman
Posts: 803
Joined: Fri Oct 30, 2009 10:36 pm

by fogman

In my experience, the paint does not crack unless the carbon fiber underneath is also cracked.


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ALAN Carbon+
Posts: 250
Joined: Mon Dec 26, 2005 9:21 am
Location: Canberra, Australia

by ALAN Carbon+

Thanks for everyone's input so far. I have contacted the shop that I bought the frame from to have a further conversation with them about the frame. The owner of my LBS's view was that if it was his frame, he would expect it to be replaced.

FIJIGabe wrote:It looks like a paint crack, but I would recommend you listen to the CyclingTips podcast from Feb. 19. They interviewed Raoul Luescher from http://luescherteknik.com.au/, who talked about his technique for scanning CF. I've got no connection to them, but since you're in Australia, it may be worth a look, for peace of mind.


Thanks, went back and listened to that podcast the other day, I also watched one of his YouTube videos specifically about paint cracks which was useful.

jfranci3 wrote:Looking at it again, it looks like the cable grommet is attached on the outside of the structure, under the paint. I bet they do structual layups, attached the grommet, and then put the finish layer on. That or the grommet is glued onto the top and blended in with some goo. The crack is probably nothing to be worried about given the C shape, a structural crack would be a line in a given direction.


The internal cable guide looks to be built into the frame, there is a metal sleeve that is inserted into the guide that acts as a cable stop for mechanical groupsets (swapped for a grommet for Di2) there is also a rubber grommet on the outside that secures the cable outer in the cable guide so it doesn't rattle. This thread has a good pic of the internals viewtopic.php?t=106971

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ALAN Carbon+
Posts: 250
Joined: Mon Dec 26, 2005 9:21 am
Location: Canberra, Australia

by ALAN Carbon+

Lapierre has refused the second warranty claim after my local bike shop submitted a new claim based on his inspection. They remain adamant that it is a paint crack despite my LBS expressing that they think there is more to it.

The frame will be stripped over the weekend and sent to Luescher Teknik to have a detailed examination done.



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FIJIGabe
Posts: 1513
Joined: Tue Sep 11, 2012 6:07 pm
Location: The Lone Star State

by FIJIGabe

Thanks for following up.
Madone 9 https://goo.gl/7UwZpV
Crockett https://goo.gl/f5PdCN
Madone 5 https://goo.gl/cMdyFo

Madone 4, Cobia. I own a lot of Treks.

by Weenie


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