Trek offers a carbon fiber seat post that is reinforced with aluminum inside. If you get that one, then you can put a seat post rack on it but there is still a limit of 25# for the rack. I got one so when I ride to work I could ditch the backpack and carry my stuff more easily. At first I took the rack off for recreational rides, but it's too much bother. Much more convenient to just leave it on. Do I care what other cyclists think? Not hardly!



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