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How do I pull out a carbon seatpost on a carbon frame? It seems so hard for me... Do I need a special tool, or just ask help from a local bike shop?

done with the seatpost. I made the frame and fork reversed hold the bottom bracket with my tripod, install a saddle on it and gave a big bang on the saddle about 20 times and done.

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    I know that often the seatpost gets stuck in a regular steel bike with aluminum or steel post. It sometimes helps to gently pry open the clamp.
    – Daniel R Hicks
    Jan 7, 2012 at 13:33
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    Like I said, gently pry it open a hair. And if the clamp isn't bonded to the seat tube, gently pry open the slit in the seat tube.
    – Daniel R Hicks
    Jan 7, 2012 at 14:16
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    can i use heat gun for carbon seatpost stack into carbon frame ? will it damage the paint job ?
    – Rick Ant
    Jan 9, 2012 at 7:12
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    A hair dryer, maybe, but not a full-on heat gun -- too hot. If your intent is to expand the outer tube, you could try wrapping the tube with rags dipped in very hot water.
    – Daniel R Hicks
    Jan 9, 2012 at 11:47
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    I reckon the heat gun question could be asked as a separate question on here, as it may have value to others
    – Rory Alsop
    Jan 11, 2012 at 13:42

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Try to push the seat down slightly.The carbon weave can act the way those finger cuff toys we had as children did (the more you pull the tighter they get).By pushing down you release the grabbing action.Make sure you use something similar to Park Tool Carbon/Alloy Assembly Lube before you reassemble it,check with your local bike shop for their reccomendation.

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  • I will ask for local bike shop for a help, it's an aero seatpost and it's carbon....
    – Rick Ant
    Jan 8, 2012 at 3:26
  • I think, the best way is, visiting a local bike shop and ask for assistant since the shape of the seatpost is, aero seatpost and tear drop model...
    – Rick Ant
    Jan 8, 2012 at 7:28
  • can I insert another 10cm into the seat tube ? I have done 11cm inserted...
    – Rick Ant
    Jan 8, 2012 at 9:18
  • can i use wd40 or plusgas ?
    – Rick Ant
    Jan 9, 2012 at 5:57
  • i've been thinking, I put a saddle into the seatpost, put the frame upside down and try to hammer the saddle ...what do you think ?
    – Rick Ant
    Jan 11, 2012 at 6:55
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For Aero seatposts, smack the saddle nose solidly sideways with your hand, you should hear a loud crack, this is the surface tension breaking. Seatpost should then move OK. Saw this done by ex-Pro who was Giant dealer on a Propel, made my life so much easier since I learned that tip

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  • Just to clarify, is this just for seat posts that can't rotate in the frame because they're not round ? Cos seems like good advice for all seat posts regardless of the shape.
    – Criggie ♦
    Oct 26, 2017 at 23:29
  • That's a great answer. Worked like a charm, thanks! Do you have any idea wether some kind of lube needs to be used on Propel's aero seatpost? Didn't receive any in the box so i didn't use any.
    – maephisto
    Jun 7, 2018 at 18:01
  • This worked perfectly for me and saved me a substantial amount of time. Thank you!
    – Retired account
    Jun 11, 2019 at 23:27
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Twisted the saddle as suggested above which worked a treat at breaking the friction. I then used the flat part of a D-Lock (with a rag to stop metal on metal) under the front of the saddle as an upward hammer. Job done after 3 clunks.

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I have an Aeropost that got stuck after I used my 2014 Giant Defy Advanced Carbon Fibre bike to commute (bike had to be stored in a cage outside during workday... in Canada therefore Fall temp btwn 1-10 degress).

The seat post is an Aero (tear drop shape) in a carbon frame.

Had been stuck for three years, but with a combination of Carbomove AND using this reversible clamp as a spread I was able to finally remove the seat post.

Technique involved spraying with Carbomove for a few days then, when the clamp arrived, using it as a spreader from the bottom bracket to the front of the seatpost... After a handful of squeezes on the clamp to apply outward pressure, the seat post popped out.

I called 15 otherwise really reputable bike shops and they all said it would be over $100 and may not get it out anyway. Oh and it may break your frame and almost certainly will ruin your seatpost...

Hope this helps others in the same spot.

Cheers.

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use drain cleaner, NaOH sodium hydroxide, in a syringe or in drops. make a fully saturated solution with water and drip those drops down the edge. let it work its magic. this can be used to dissolve the whole tube as well. you need to keep it warm to make it work. I used a blowtorch on the tube outdoors to keep it warm.

take off the seat and use a vice to hold the tube esp if it is excentric on the top. twist the fram. try some lube. Not sure exactly what worked but that is what i tried and it worked. Anyone got an idea how to twist the alu sleve back in position though?

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    It sounds like NaOH can dissolve the resin; wouldn't this destroy the seat tube as well?
    – DavidW
    Feb 27 at 19:51
  • If you're managed to remove the aluminium liner sleeve from the frame, then this solution probably isn't ideal.
    – Criggie ♦
    Feb 27 at 22:14

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