Help with stuck Carbon Seat Post in carbon frame.

[Brian Cdn]

Helping a friend to try and remove a stuck carbon seat post in a carbon frame. His local bike shop wasn't very helpful.

Looking for some suggestions from our learned forum as to how to free up the post ?

Is there a lube that will help unbind it ?


Thanks in advance

B

[cmbicycles]

What material is the frame it is stuck inside, and are you wanting to save the post? Is it just corrosion or was the clamp over tightened and deformed to tubes?
I have found boeshield to be pretty good at loosening things up for corrosion type bonding. Spray it, let it marinate, repeat as necessary. Time and patience are your friend for this, you just want to get it so you can move it a little, then repeat the marinating process and it should get slightly looser each time. You can also try warming up the frame with a hair dryer, as it will help the penetrant flow more easily, and maybe give a little expansion. Just don't spray the hair dryer :eek:

[Brian Cdn]

Thanks..

It's a carbon post in a carbon frame..

[rando]

Carbon on carbon sounds fun.

I'd remove the fork and BB and leave it sit outside some cold night. Bring it in and pour warm, use discretion and certainly not above body temp, water over it and into the seat tube through the BB to see if that breaks it free enough to get some movement. Be careful how fast you warm it back up of course.

Personally I'd be concerned about soaking it in petroleum based solvents that might interact with the resin with negative results. Short term to lubricate it during removal, no problem.

[Scooper]

Good tips on Sheldon's website about stuck carbon seatpost in carbon frames. Tip #13:

http://www.sheldonbrown.com/stuck-seatposts.html#carbon

[ultraman6970]

Wonder if the frame has an aluminum insert, some frames do, that could explain why the seatpost is stuck in there.

[bcroslin]

My advice is to not do this yourself. I've damn near destroyed a frame trying to remove a carbon post from an aluminum frame and a friend who was sure he could do it DID destroy one of my frames with the same issue. Ask around and you'll find out who in the area can deal with a stuck post and then pay the money to have them take care of the problem. You may even end up at a machine shop. Do not do this on your own. The $40 you pay will save you time and the heartbreak of destroying a bike.

[cheshirecycle]

PB blaster... Might void your warranty...

[Charles M]

Carbomove...

http://www.cantitoeroad.com/effetto-mariposa-carbomove

http://www.cantitoeroad.com/image/data/products/effetto_mariposa/New2012images/carbomove_no%20background.jpg