Seized seatpost...VICTORY!

Discussion in 'Bicycle Mechanics and Repairs' started by brucers, 23 Dec 2017.

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  1. brucers

    brucers Veteran

    Location:
    Scunthorpe
    Tried wd40, tapped with hammer, upside down in vice. Seems all that is left is to cut off and file away till next Xmas! 2 things....is there anything else I can do before last resort of file. 2nd, any tips n hints on file process.....how low should I cut off post. Steel frame, probably steel(?) post, late80's, early 90's Sparta.

    Ding dong merrily on high and all that to you all.
     
  2. PHL67

    PHL67 Über Member

    Location:
    Frinton on Sea
    I usually heat them up and put post end into vice tighten up severely then start to twist the frame. I usually use GT85 first, leave for the day the go with the heat.

    Not failed me yet.

    Some people I know use full sugar Coca Cola as that eats anything, especially corrosion.

    Hope this helps.
     
  3. simongt

    simongt Über Member

    Location:
    Norwich
    A method I read of once is to invert the bike, drill a suitable sized hole through the seat pin - inverted, you won't get drill swarf in the bottom bracket. Bike back upright, apply suitable lube and leave to work in. THEN, get a tommy bar, put it thru the hole you've drilled and gently twist each way. Works apparently. All you'll need then is a replacement seat pin.
     
    Last edited: 23 Dec 2017
  4. OP
    OP
    brucers

    brucers Veteran

    Location:
    Scunthorpe
    Ahhh the coca cola option.....forgot about that...yes it helps....how much will depend! Thanks.

    Found Sheldon advice about cutting the length of the tube inside then rolling it in on itself....not sure how I'd get enough grip to actually rolling it especially given my vice could not hold against me twisting the whole bike against it!
     
  5. OP
    OP
    brucers

    brucers Veteran

    Location:
    Scunthorpe
    Pondered that but not sure my drill is up to it (yes it's crap) and that I have a bar tough enough!
     
  6. OP
    OP
    brucers

    brucers Veteran

    Location:
    Scunthorpe
    Frame def yes.....seatpost is one of those standard types of that era.
     
  7. Cycleops

    Cycleops Guru

    Location:
    Accra, Ghana
    davidphilips likes this.
  8. OP
    OP
    brucers

    brucers Veteran

    Location:
    Scunthorpe
    My shed has all sorts of rubbish....but a slide hammer no!!
     
  9. rrarider

    rrarider Senior Member

    Location:
    Liverpool
    The best penetrating fluid used to be called Plus Gas. I believethat it is still available. WD40 and GT85 are just lubricants.
     
    Mr Celine, tyred and mjr like this.
  10. woodenspoons

    woodenspoons Über Member

    Location:
    North Yorkshire
    PlusGas is good.
     
  11. Drago

    Drago Guru

    50/50 mix of ATF and white spirit.
     
  12. OP
    OP
    brucers

    brucers Veteran

    Location:
    Scunthorpe
    Whats ATF?
     
  13. alicat

    alicat Guru

    Location:
    Staffs
    Automatic transmission fluid according to Google.
     
    Drago likes this.
  14. ColinJ

    ColinJ It's a puzzle ...

    It is interesting reading these suggestions because I discovered that I have managed to get my titanium seatpost stuck in my aluminium Cannondale. I was aware of the risk but forgot to take precautions ...! :wacko:

    It is not imperative that I loosen it because the saddle height is pretty good but I did fancy moving it up by about 5 mm to see how that felt. I don't want to damage the frame or the post so I won't try anything too drastic, but if any of the non-destructive methods are likely to work then I will give THEM a go.

    I think that Al expands much more with heat than Ti does so I thought about aiming a fan heater at the point where the post goes into the seat tube and seeing whether thermal expansion would break the bond between post and tube.
     
  15. User32269

    User32269 Guest

    I've always found squeezing a can of spinach until it bursts, then swallowing the contents as they drop, helps me loosen any stuck metal?
     
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