In Reply To:
I didn't read all the replies but...
that is a known issue, call trek they will tell you. it is the paint cracking. they told me they had fixed this with the new TTX, guess not. What happens is the carbon and the paint do not have the same flex, so paint clear coat cracks also you might get a second one at the seatstays.
Don't worry it is only cosmetic, but hey it sucks to have some sort of crack on the tube after paying $$$$$
I wonder if anyone from Project 1 paint has this issue????? They do - Tillquists TTX is actually a Project one...
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//FRISK
Save a bike - ride a triathlete