I have read and been told that Coca-Cola will work to free a stuck/frozen seatpost. One person even said that after putting Coke in the seat tube for a couple days, the seatpost would slide right out. So I decided to test the Coke method of seatpost removal. I left the frame with Coke in the seat tube for a little over two weeks to see if it would have any effect. This is a steel frame with an aluminum seat post. So there is most likely galvanic corrosion in there. The results with a steel seatpost in a steel frame might be different. I could have used Pepsi, but most people reference Coke, so that is what I used.
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