Yes, Mecacyle frames usually have an internal expander seatpost.
Just did some googling and realised that the split seat-tube allows a modded conventional seatpost to be used cause you can tighten it from beneath. http://i52.photobucket.com/albums/g2/billyspaceman/Thomson10.jpg
I've always loved the look of them -but what a hassle, I passed up on a Peugeot which took one a couple of years ago because proper int exp post can be impossible to find and regret it now.
@absurdbird started
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Just did some googling and realised that the split seat-tube allows a modded conventional seatpost to be used cause you can tighten it from beneath.
http://i52.photobucket.com/albums/g2/billyspaceman/Thomson10.jpg
I've always loved the look of them -but what a hassle, I passed up on a Peugeot which took one a couple of years ago because proper int exp post can be impossible to find and regret it now.