help! stuck seat post :(
Boiling water. Penetrating oil. Tapping the post with a hammer to try and break the bond.Posted 3 years ago
Then, when that fails
Post in a big vice and use the frame as a lever.
If you can’t get a vice then a drill hole through the post and pass a bar/big screwdriver through it to work as a lever.ollie151Member
anyone got any advice on getting a stuck seat post out?
i know i can use a blow torch on the frame but i dont want to damage the paint.
im currently spraying oil on it every day, and riding with the seat clamp undone in the hope that my body weight will move it.
what else can i do????Posted 3 years agomick_rSubscriber
I tried all of the above including a huge vice at work and enormous force – none worked (ally post in steel frame).
The only remaining method without damaging the paint was cut off the post, then remove with expanding reamers. It took about 3 hours in total, working up through full adjustment range in 3 sizes of reamer. Quite a lot of energy and sweat was involved……. It produced about 2 mugs full of swarf until the final skin of the post peeled out.
Industrial freezers or liquid nitrogen also work, but it was a brazed frame and I was bothered about breaking joints due to brittle fracture.Posted 3 years agooldnpastitSubscriber
I used caustic soda (sodium hydroxide).
For something so incredibly dangerous, I was a bit amazed that you can just walk into a garden centre and buy it for tuppence.
Remove the bottom bracket, bung up the BB shell with an old inner tube and then pour in hot concentrated caustic soda.
USE EYE PROTECTION!!!!
Seriously, this stuff is lethal! Rubber gloves also essential unless you are tired of your own skin.
You get a mixture of hydrogen gas, steam and left-over caustic soda frothing out of the tube. Not nice.
A couple of nights of doing this and it came out (well, disintegrated).
(Annoyingly, my previous attempts to remove the tube using brute force had damaged the frame so I’m still working out what to do with it).
EDIT: it’s not kind to paint, but not as bad as you might imagine. Probably if you put tape over the paint it would be fine.Posted 3 years agodeadkennySubscriber
I had an alloy post bonded in carbon. Tried all kinds but possibly the snowboard/ski base cleaner helped the most. Basically a citric acid solution. Then required a hell of a lot of effort constantly trying to rotate it or the frame. Gave me aching arms and it made a hell of a noise squealing as it eventually rotated. Probably would have been much easier with a vice though. Since then, don’t leave alloy and carbon mixed together as it does react and bond in certain conditions, so I remove the post when not in use. Also a smearing of carbon assembly paste helps prevent it bond. Can be used for alloy in alloy also and helps reduce clamping force required.
Not sure on steel and alloy, but a similar reaction to carbon and alloy could occur I guess. It’s a galvanic corrosion and occurs more with dissimilar materials.Posted 3 years ago
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