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Seized Seatpost

Old 04-30-18, 07:25 AM
  #1  
gettingold
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Seized Seatpost

I have an oldish (10 y/o) CF frame with a carbon seatpost that is completely fused to the seat tube. Thoughts on freeing it up? Brute force did not work. Thanks.
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Old 04-30-18, 07:29 AM
  #2  
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A bit more info. It is not the seat clamp; that loosens right up.
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Old 04-30-18, 07:51 AM
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Interesting, i haven't tackled a carbon on carbon seized seat post

I'd try hitting the post [seat off] using a rubber mallet to see if it moves [mark it before hand for a guide] if it moves then fit the seat back on to use as leverage to try and twist it off
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Old 04-30-18, 08:39 AM
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I will try again, thanks. Anybody know if WD-40 damages carbon?
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Old 04-30-18, 08:44 AM
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Id start with soaking in the penetrating oil of your choice.
then Id hook a slide hammer to the saddle clamp.
if that fails Id cut the post fairly close to the frame and bring out my Secret Weapon - a wooden dowel, split lengthwise, with a hacksaw blade recessed into it.
The cutting depth of the blade is too shallow to hurt the frame, but will cut a groove deep enough into the post to allow the post to be collapsed and peeled out.
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Old 04-30-18, 09:08 AM
  #6  
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Originally Posted by gettingold View Post
I will try again, thanks. Anybody know if WD-40 damages carbon?
I don't think oils are good for carbon somehow, going off my experience with fibreglass

so i wouldn't use grease as a preventive measure either, i'd think about an anti seize product or a wax release agent

but lets see if we can get the thing off first

if belting it down a bit and trying to twist it off didn't work, try removing the BB, seal off the top of the seat post and turn the bike upside down
try to penatrate it with liquids that won't hurt the carbon, i'd try to soak with water first pouring it through the BB

Last edited by le mans; 04-30-18 at 09:15 AM.
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Old 04-30-18, 09:13 AM
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Thanks all.
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Old 04-30-18, 09:20 AM
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compressed air would be anther thing i'd try, place the nozzle on top of the seat tube area to try and release it
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Old 04-30-18, 09:43 AM
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It's odd that carbon would fuse to carbon. I wonder if the bond is from the clearcoat on the post and inside the seat tube. Basically paint sticking to paint.
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Old 04-30-18, 10:35 AM
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Originally Posted by HillRider View Post
It's odd that carbon would fuse to carbon. I wonder if the bond is from the clearcoat on the post and inside the seat tube. Basically paint sticking to paint.
Perhaps grease was used to prevent it from seizing which might have caused it to fuse, if you think about it, [carbon] epoxy resin is oil based, might have reacted to it

there's a problem with using grease on aluminum stems and seats posts if there going into steel frames too, i use an anti seize product for that situation
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Old 04-30-18, 04:01 PM
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Originally Posted by le mans View Post
Perhaps grease was used to prevent it from seizing which might have caused it to fuse, if you think about it, [carbon] epoxy resin is oil based, might have reacted to it
Epoxy resin cures by cross-linking and it's not soluble in much of anything.
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Old 04-30-18, 04:22 PM
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Some types of grease containing chemical acidic solvents may affect the two part component resin
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Old 05-04-18, 11:54 AM
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Completely disassemble the seat part. Screw in a pipe or something that gives you mover leverage. Hope for the best and try to twist it out.
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Old 05-04-18, 02:10 PM
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Cut it off and have a Machine Shop bore out the rest... once they drill it out to 25mm, you can buy seatposts that size..
1"- 25.4 mm.. once you can get an adjustable reamer in there you can make it bigger.

Extended seat tubes are a thing, maybe the fused post can function like one..
cut it off high, slot the back add a band clamp and fit in a smaller seat post.




...

Last edited by fietsbob; 05-04-18 at 02:14 PM.
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Old 05-05-18, 11:45 PM
  #15  
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Sheldon the legend Brown site:
https://www.sheldonbrown.com/stuck-seatposts.html

Point 14. deals with a stuck carbon seat post. With some other (more general) tips and tricks.
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Old 05-06-18, 09:09 AM
  #16  
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Since there isn't a good reason for carbon to stick in carbon, I would soak it in windex to dissolve any sports drink sugar that might might be acting like glue. (Windex has low surface tension, as does soapy water.)
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Old 05-06-18, 09:30 AM
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BB/crank out and bike upside down , you can pour stuff in the seat rube to let it seep in with some volume behind it..
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Old 05-06-18, 09:49 AM
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Originally Posted by fietsbob View Post
BB/crank out and bike upside down , you can pour stuff in the seat rube to let it seep in with some volume behind it..
Not many carbon frames have vent holes in the BB shell. The water bottle cage holes would be better.
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Old 05-06-18, 10:03 AM
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Pour penetrating oil all over let sit. Then put the seat post in a vice and clamp hard. Use the bike frame and twist it off. It will come off I have had to do it on CF seized to aluminum seatpost Eventually it will give. You could drill hole in seatpost and then get long steel rod and use that for leverage. It is all about leverage. Can also soak in Coke or pepsi.
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