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I’ve spotted this crack on my carbon fork, only on the left side. The crack is exactly at the joint of aluminum dropout and carbon body of the fork. My bike is a 2010 Trek Madone Project One (OCLV carbon) and the fork is Bontrager RXL. Yesterday I’ve sent an enquiry to Trek via my bike shop, waiting for their response.

I am curious if there is anybody who experienced anything similar? Thanks!

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    Try tapping with a coin. If the sound changes and becomes dull around the cracked paint, the underlying structure is cracked. See google.com/search?q=carbon+fiber+tap+test Jun 3, 2019 at 0:11
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    @Daniel Hicks Pretty bold statement when that crack in the paint appears "at the joint of aluminum dropout and carbon body of the fork."
    – Jeff
    Jun 3, 2019 at 1:41
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    You'll get as many answers as there are replies. The only answer you should trust is from the manufacturer and from your LBS who has seen it in person. And even then they could be wrong. Aside - good work spotting the crack.
    – Criggie
    Jun 3, 2019 at 4:52
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    Stop using it at once and have it examined. If any doubt remains, have it replaced. This is potentially lethal.
    – Carel
    Jun 3, 2019 at 7:42
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    @KürşadTerzi What was the result? It would be great to know. Jan 8, 2020 at 9:39

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It is most likely a carbon crack. Either way, do not even ride it down the driveway.
The awesome news is that trek warrants that and you can expect a replacement.

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  • Reading through the Trek warranties is a bit hit and miss, I can only find info for 2018-2020 bikes, nothing is mentioned about 2010 models and if your a subsequent owner your warranty is only 3 years and not lifetime
    – Dan K
    Jan 11, 2020 at 5:25

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