Anyone know how to get a seat post unstuck?

[PaulB]

As the title says, does anyone have any advice/tips/suggestions on how to free a seat post from the bike frame?

I've put a new gruppo on an old bike frame and the only cranks I could get are 175mm where the ones on the previous incarnation were 170 and that 5mm - it might not seem much - it irritates my perineum and I could do without it but the seat post seems super-welded into place and it will not shift.

 

[fossyant]

There is a man who can not far from you, the seat post man.

 

[Ajax Bay]

Frame material? Seatpost material? Pretty unusual to "put a new gruppo on an old bike frame" without taking out, cleaning, light greasing and replacement of the seatpost, imho.

 

[ColinJ]

Good luck with that - I have the same problem on my (road) Cannondale. A titanium post in an aluminium frame and I forgot to put that special anti-corrosion paste on it first.

I'm too scared of damaging the frame to use major force on it.

There is a man who can not far from you, the seat post man.

So there is - HERE!

 

[PaulB]

That's brilliant, thanks everyone.

The post is aluminium and the frame is carbon.

 

[irw]

That's brilliant, thanks everyone.

The post is aluminium and the frame is carbon.

Ahh, in that case, just pop a splash of water on it, it'll fall out in no time.

 

[Big John]

https://www.velonews.com/gear/stuck_seatpost/

 

[iluvmybike]

Dont mess and risk ruining yuor frame and seatpost - go and see the seat postman https://theseatpostman.com/

 

[ColinJ]

Has anybody mentioned the seatpost man yet...?

 

[MichaelW2]

Not that way

View: https://youtu.be/siVMhZoYgh0


This way


View: https://youtu.be/_gAXL2FSY_A

 

[matticus]

Pretty unusual to "put a new gruppo on an old bike frame" without taking out, cleaning, light greasing and replacement of the seatpost, imho.

At which point you find the seatpost is stuck. Which is exactly the problem the poster is asking for help with ...

 

[Fergs]

Has anybody mentioned the seatpost man yet...?

If you say his name five times while looking into a mirror…he’ll appear!

 

[Dolorous Edd]

This way


View: https://youtu.be/_gAXL2FSY_A

So it's simply a case of pulling as hard as it takes? Can that really be the best way?

 

[Big John]

You persevere is what you do. You pour penetrating oil down the seat tube whichever way you can. If you have bottle cage bolts in the tube remove them and spray oil inside and lots of it. Turn the frame upside down and wait, at least 24 hours to start with. Then make sure the saddle is bolted on securely and try and twist the seat post. Once you have it twisting you've broken that bond and you're at least making progress. Then it's a case of securing the bike and start trying to pull the post out. If it's still a problem then more penetrating oil, more waiting. The problem here is the carbon frame. You have to use a sensible level of caution. No one wants to crack a carbon frame. Rush it and you could deeply regret it 😭

 

[MichaelW2]

Aluminium oxide is dissolved by acid, hence people use coca cola. Vinegar is less sticky option. Invert frame and pour through open bb. Leave for several days.