stuck seatpost

5pudgun
5pudgun Posts: 402
edited November 2015 in Workshop
Hi,the carbon seat post in my aluminium giant defy is stuck,any sensible advice to free it most welcome.

Comments

  • arlowood
    arlowood Posts: 2,561
    [url=http://www.bikeradar.com/forums/viewtopic.php?p=19737750#p19737750]5pudgun[/url] wrote:
    Hi,the carbon seat post in my aluminium giant defy is stuck,any sensible advice to free it most welcome.


    Get as much GT85 or equivalent round the clamp area as possible and leave it to soak overnight preferrably.

    The following day, remove wheels, upend bike and clamp the saddle in something (bench vice if available or just between your feet or something else to stop the saddle turning). Using the frame as a lever, try twisting the frame back and forward around the stuck seat post to see if that will free it. The frame is a much bigger and better lever than the saddle - hence this advice.

    If that isn't successful then a more drastic approach is to strip off your chainser and remove the bottom bracket. This should allow you access to the bottom end of the seat tube and you can pour GT85 into that with the frame up-ended and leave to soak as before. Repeat the frame lever procedure to see if that works
  • Monty Dog
    Monty Dog Posts: 20,614
    GT85 is a light oil in an aerosol spray - it will do little to release a seized seatpost due to galvanic corrosion.
    Use ACF-50 anti-corrosion spray to dissolve the aluminium oxide an increasing degrees of force. If it's really stuck:

    http://www.sheldonbrown.com/stuck-seatposts.html
    Make mine an Italian, with Campagnolo on the side..
  • 5pudgun
    5pudgun Posts: 402
    Thanks for replies guys. Any one done this or is it all theory.
  • boblo
    boblo Posts: 360
    Well the first response is complete bolleaux so I'd treat with caution....

    I've read this bod gets good results without damage. ££'s though. Risk vs reward...

    http://www.theseatpostman.com

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