Bicycle Mechanics - Repairing a carbon frame - Advice?
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09-10-10, 02:47 AM
Help! My much beloved LOOK KG231 (about 15 years old) developed a creaking sound, which I think is coming from the lug where the carbon tube is glued into the aluminium lug, (Its the bottom tube from the crank to the headset) I suspect that a recent attempt to ride some "Roubaix" type cobbles in Belgium have cracked the glue. I can't find any references to this being repairable, clearly I don't want to risk a failure/accident - yet I really don't want to scrap this beautiful old bike.
Any advice or experience of similar problems?
It's possible that the frame is still fine, and you're hearing movement of the BB cartridge or cups in the shell. Otherwise the only good news here is that a failure of that joint isn't likely to cause any kind of accident or injury.
There are a number of people who do these types of repairs here in the USA, or you can contact Look to see if they'll handle it as a warranty, or who they recommend you send it to. BTW- it's possible that warranty isn't an option until it's clear that the joint is failing, manifested by visible movement, not just creaking. In that case consider putting up with the noise a bit longer until it meets that standard.
09-10-10, 09:43 AM
Do you actually live in Belgium or was this just a visit? If you are an American, one of the most well thought of carbon repair specialist is Craig Calfee (www.calfeedesigns.com) in California.
I also recommend contacting Look (or their importer) to see if they will honor a warranty claim first.
09-11-10, 11:06 AM
No I'm British, can't find anyone in the UK who can look at the problem, the frame is ~15yrs old - hence warranty not an option!
09-11-10, 01:38 PM
To test for movement you could start by putting some tabs of paint or nail polish over the exposed edges of the joints in that area. Then after the paint has dried for a few days so that it's hard and more brittle go for a rough and "creaky" ride. If the paint lines bridging any of the joints is cracked afterwards then it is a sign that there is some movement in that joint.
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