Seatpost stuck - where would I get Caustic soda from?

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  • Well, except in the unlikely event that it's aluminium inside steel, because aluminium expands more than steel, so heat would only make the problem worse. I can't think of anywhere that might happen. Maybe some kind of aluminium pole, or post, inside some kind of steel tube...? No, I agree, seems pretty unlikely.

    But steel expands at a lower temp, hence why heating works

  • I thought that both alu and steel had more-or-less constant coefficients of thermal expansion over the range of temperatures you can achieve in a garage... but I can't find any nice graphs, so feel free to set me right.

    Saw a google answers thing suggesting that heating alu inside steel might crush the alu when it expanded, making it easier to get out when it contracts again, which sounds (more) plausible.

    Anecdotally - heating never worked for me, though cooling has done.

  • i've never had any fluid, anomina caustic etc. do anything to get a totally jammed post out.

    grind top off and pad saw down inside - it doesn't take that long

    Caustic soda will get any post out with time.

    http://www.lfgss.com/thread1083-4.html

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Seatpost stuck - where would I get Caustic soda from?

Posted by Avatar for Munch @Munch

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