By sfmwright - 8/6/2014 1:22:41 PM
I have a crack on my front derailleur braze on on my carbon bike. The crack is narrow and is not all the way through the braze on tab - on inspection it does not appear to be deep. Unlike most bikes, the braze on is actually moulded as part of the frame and not riveted or bolted on - so a replacement is not an easy option.
I was considering repair options, and wondered if using your Black Epoxy Repair filler would suffice or of there was a better recommendation?
The tab holds the front derailleur onto the bike - so the stress of the derailleur moving the chain between chain rings is all it has to deal with. It is an electronic shifter, so there aren't any additional forces from a cable that a mechanical shifter would cause.
Thanks
Steve
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By Warren (Staff) - 1/27/2015 9:19:04 AM
Cracks in carbon are often like iceburgs - the bulk of the damage is hidden.
Using a filler won't repair the broken fibres and thus won't restore the strength. You ideally need to add extra reinforcement to add strength back to where it has been lost.
It's a critical area of the frame so you need to be sure you have done the repair properly. Might be worth speaking to a bike repair shop for thier views if you are in any doubts.
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