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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 – Andrew Henle Jun 3 at 0:11
  • Almost certainly a paint crack. – Daniel R Hicks Jun 3 at 1:16
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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 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 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 at 7:42

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