I recently picked up my first carbon fiber bike which has a carbon fiber seat post that seized to the frame due to rust. I did not initially think that was possible but after looking at it, I believe there's more to this than meets the eye.
When taking a magnet to the frame I can see that there IS steel in the seat tube so is it the case that a carbon fiber seat post and/or a carbon fiber frame can have steel sleeves? The bike is a (2001?) Kestrel 200SCI. I want to understand the components at play here so I can safely work on unseizing the seat.
You can see how far down the steel goes by the placement of the circular magnet on the frame in the picture.
(Please note, I did not take a hammer to the seat post, that was the previous owner - thankfully the frame remained intact)