You should strip the frame, soak the post/inside of the seat tube with PB Blaster daily for a week or more, then sacrifice the post by clamping in into a big bench vise and trying to twist it using the frame for leverage.
July 1st, 2013 02:23 PM
Hmmmm, galvanic reaction with 2 dissimilar metals. Get some strong commercial ammonia. Put frame upside down. Put it in through the seatpost bottle mount. Keep adding. Will sacrifice the seatpost, maybe. Lots of ideas over on bike forums.Try heating the seatpost