Seat post is seized

Discussion in 'HOW TO' started by Majestic_B6, Apr 4, 2014.

  1. Majestic_B6

    Majestic_B6

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    Anyone have experience removing seized seat posts' ? No luck with a sledge, vise grips or a bench vise. I've filled the entire tube with PB blast to let it penetrate for a few days then hit it with a heat gun until boiling. I've had a few stems that have taken a month or two to finally release but I'm kind of in a hurry to get this out, any tips/tricks?
     
  2. Bicycle808

    Bicycle808

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    What size post? I've had luck with 1" and 7/8" posts that were stuck where I clamped a stem on there and clamped the stem to a fork for leverage and just muscled it out. Wouldn't do it with a stem or fork I cared about, though
     
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  3. cman

    cman Moderator

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  4. Majestic_B6

    Majestic_B6

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    I believe it's 13/16"?
     
  5. Majestic_B6

    Majestic_B6

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  6. FastForward

    FastForward

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    This is the way I get a stuck seat post out.
    Spray pb blaster on it let it sit for a few minutes.
    Flip the bike frame upside down and clamp the seat post in a vice.
    I have a big heavy 40 or 50 lbs. vice.
    And use the frame for leverage and pull up and twist the seat tube back and forth to loosen the seat post.
    I have NEVER seen one that would not come out like this. NEVER.
    JKent
     
  7. mikeeebikey

    mikeeebikey

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    I have seen the ones that have become oxiwelded. Beating on the seat post turn it, if it will! Shock works.
     
  8. farmallman

    farmallman

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    Ive had to drill a hole in the seat post and chain it to my truck and chain the frame to a tree and slowly pull forward. Its not too fun but it works.
     
  9. Majestic_B6

    Majestic_B6

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    Using a torch sounds like a lot of fun but not an option for me, I guess I'll just give it more time to penetrate the rust before trying to loosen it again.

     
  10. Deathbike

    Deathbike

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    I've used a chain wrench with some success when chemical means were not feasible. Expect to wreck the seatpost though.
     
  11. dxtom

    dxtom

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    Cut the seat post. I'm assuming it's hallow. Turn down a shaft to fit. Then place a new post on top of the shaft and tack weld it. Seat clamp should tighten to hold in place. Just an idea. :bigboss:
     
  12. dxtom

    dxtom

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    Can you post a picture of this frame? :bigboss:
     
  13. dxtom

    dxtom

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    Thanks for the pictures. Time and rust is nature's welder and sometimes it wins.
     
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  14. Sinner4

    Sinner4

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    I welded on a 3 ft cheater bar. And then twist
     
  15. mikeeebikey

    mikeeebikey

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    I am glad you got it out!
    I have a 2 man pipe wrench I use as a last ditch effort! Usually it twists the frame....
     
  16. cman

    cman Moderator

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    I have cut a seat post out a Schwinn Hornet using a hacksaw blade. Fun times.
     
  17. SILVERKINGPC

    SILVERKINGPC

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    pb blaster...torch heat...twist w/leverage...repeat
    again until it moves one day... PATIENCE will pay off.
     
  18. Sinner4

    Sinner4

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    On an alloy post I used a Saw Sall. On a stuck stem, I used heat and melted the aluminum stem out
     
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  19. kemmer

    kemmer

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    I have never been bested by a stuck stem, but stuck seatposts have beaten me. The trick is time... PB blaster every couple of days, go back to twisting and hammering every couple weeks. Throw in some heat every once in a while for good measure. I think even the most stuck seatpost will come out eventually, given enough time and penetrating oil. The times I've been beaten were when I wasn't patient enough and ruined the fame by trying to manhandle it too hard, or by trying to cut out the seatpost.

    One thing I've always wanted to try but never had the means... Stick the whole thing in a freezer for a day, pull it out and heat the frame with a torch. I've used this technique to put seals and bearings in without the appropriate press, but don't have a freezer big enough for a whole frame.
     
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  20. kemmer

    kemmer

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    Also, this stuff is the ultimate in penetrating oils: http://www.kanolabs.com/penLub.html I mentioned PB Blaster cause it's the best stuff that's easy to find, but this stuff makes PB blaster look like fish oil.
     
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