Join Date: Mar 2009
Location: Missoula, MT
Bikes: Giant TCX 1 touring conversion
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
In a word: no.
In more than a word:
IF you were using an aluminum seatpost, you might squeak it in, but carefully, and with some grease.
With a carbon post, it must fit exactly.
Too tight, and the failure of the post will be compressive. Too loose, and you will bite into the post with the seattube and crack it in half. Most manufacturers of carbon seatposts and bars don't recommend the use of shims either.
Just don't do it, and save yourself some pain later.