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Stuck seatpost

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  • March 24, 2018 at 1:58 am #28280
    madcarew

    Hi Guys.

    I have a titanium frame with am alloy seatpost which have corroded together. With the aid of WD40 and careful application of torque I have managed to get the seat post rotating but it is still very stiff in place. I understand that there is corrosion which has gone on. I’m wondering what else I can do to help relieve the seat post to get it out, and secondly what I can do to prevent this occuring agian in the future. To be clear I can rotate the seat post when I put a lever on it, but it is very stiff and I need to remove it from the bike. 

    Thanks in advance

    Paul

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  • March 24, 2018 at 3:11 pm #915329
    0
    StraelGuy

    Can I just clarify here

    Can I just clarify here because we all use different terminologies. I’m sure ‘tache and jterrier are referring to anti-seize (aka copper slip etc), not carbon assembly paste.

    March 24, 2018 at 2:25 pm #915327
    0
    ktache

    +1 for the assembly paste.

    +1 for the assembly paste.

    Turn her upside down and fill her with penetrating fluid.  Soak for longer than you really want to, clamp the post, it’s probably dead anyway and then move the frame, good luck.

    March 24, 2018 at 12:12 pm #915325
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    Jimthebikeguy.com

    Finish line freeze spray.
    Finish line freeze spray. Then use assembly paste in future to avoid galvanic corrosion.

    March 24, 2018 at 10:55 am #915323
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    Jack Osbourne snr

    If it will turn it will come

    If it will turn it will come out.  

    Gets some more penetrating oil into it as it’s turning and work it round. Dont be scared about using to much as youll need to clean everything up anyway. If you’re lucky, you might get it out after just a few (many) minutes.

    If not, soak it for another couple of days and then GENTLY twist it out in a spiral motion using the frame to make the movement. If you have a vice to grip the saddle or post, great. Otherwise jam it some other way.

    Remember not to push/pull on the rear dropouts unless they are braced eg. by an old hub and do not use any more than gentle pressure… Otherwise… You’ll be buying a new frame.

    March 24, 2018 at 10:00 am #915321
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    madcarew

    Thanks all. Lennard Zinn

    Thanks all. Lennard Zinn suggests ammonia to chemicaly reduce the corrosion. For some reason I’m have a little trepidation about it. Heating and cooling and soaking in WD40 has got us to a seat post that will turn, but is still really stiff

    March 24, 2018 at 9:58 am #915319
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    madcarew
    Chris Hayes wrote:
    Foot between the downtube and seat tube, hold the seat and pull :-)…. Don’t try this with a carbon frame…

     

    A 120 kg, 2.0 metre friend who is a former internatioal rugby prop was doign that bit, but it still wouldn’t come, so I turned away from the brawn of NZ, and consluted the brains of road.cc 🙂

    good god, my phone’s inability to auto correct is nearly as embarrassing as my retarded inputs. I hope none of road.cc’s brains were hurt in the conslutation process :-/

    March 24, 2018 at 8:39 am #915317
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    Chris Hayes

    Foot between the downtube and

    Foot between the downtube and seat tube, hold the seat and pull :-)…. Don’t try this with a carbon frame…

     

    March 24, 2018 at 7:47 am #915315
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    CXR94Di2

    Use heat on the titanium

    Use heat on the titanium frame to try and expand the metal a little.  Heat and cooling could help break the corrosion.  Once post is free and out clean seat tube internals. Remove BB or work with frame upside down.  Use a brush handle wrapped in a medium grit emery paper to clean away surface damage.  Apply thin layer of grease inside seat post but not on the first inch, this will help prevent corrosion but also allow enough grip to hold seat post in position.  Take bike apart more often also works 

    March 24, 2018 at 6:37 am #915313
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    bogbrush

    theseatpostman.com

    theseatpostman.com

    If you feel you can do no more

    March 24, 2018 at 5:05 am #915311
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    StraelGuy

    Agree with Boatsie. Buy a can

    Agree with Boatsie. Buy a can of proper penetrating oil and hose it from both ends for a few days (spray down the seat tube from the bottom bracket shell as well). Would then also help to heat the seat tube with a hair drier to expand the titanium and carefully twist it out. Good luck!

    March 24, 2018 at 2:10 am #915309
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    Boatsie

    Oil. Patience.
    Oil. Patience.

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