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my thompson seat post is stuck in my crosscheck frame. Anyone got tips for removing?
i tried removing the saddle, flipping the bike upside down and putting the post in a vice and giving it a twist. No movement.
anyone?
thanks
Hit it inward
Sheldon brown has a section on it. Heat is good. doesn't need to be burn the paint hot just boiling water hot. I wouldn't hit it inwards personally
https://www.sheldonbrown.com/stuck-seatposts.html
Spray plumbers pipe freezing spray into the seat post while heating the frame with a heat gun.
I can highly recommend http://theseatpostman.com//blockquote >
this... you'll end up going there in the end, so just get in touch with him now 😉
If you are not bothered about the post itself, or the paintwork, dissolving it out with caustic soda really is a lot of fun.
Got mine out of a carbon frame recently.. penetrating oil for several day should do it. Preferably from both ends.
Or loosen off the seat collar and ride the bike over some bumpy terrain. Sometimes that works according to some posts on here.
Try break free spray. It will work I promise. I think a bottle delivered is £7 but it is always handy to have in the shed. I had a reverb stuck in a steel frame. Remove the BB, apply liberaly to the downtube whilst the bike is upside down, leave the bike (I left it for 3 days) and it will come un seized. I used to use it at work and it works wonders.
Freezer plumbers spray into Seat tube from bottle cage mounts on Seat tube if you have them. Then hot water on Seat tube. Then do the twisting thing. It'll work.
Penetrating oil alone might work too. Wd40 is not penetrating oil before that gets suggested.
Good luck.
Tmass beat me to it!
I had the same problem. I loosened off the clamp and sprayed it with penetrating oil then rode it for a few days. Eventually it loosened off its self. Not hamer or damage involved.
Bike upside, can of cola flavoured drink into seat tube via easiest hole, leave for ~24 hours before turning bike right way up and using mallet to knock saddle covered with block of wood. Worked for me with my old Peugeot 531 road bike ~22 years ago.
Do the caustic soda thing, honestly - very few things in life are more satisfying than rapidly dissolving a stuck seatpost.
Just don't do it in your living room, it turns your bike into a temporary volcano...