removing a stuck seatpost

[Aperitif]

I cant on 'ese - 'is is a serious thread. I can on some though. Especially lights. Some dim.

 

[ttcycle]

I cant on 'ese - 'is is a serious thread. I can on some though. Especially lights. Some dim.

 

[Crackle]

You must have shrunk/grown changed shoes then if it's been allright for two years.

I would just crush the seatpost with a big pair of grips and start stripping it out.

 

[ttcycle]

You must have shrunk/grown changed shoes then if it's been allright for two years.

I would just crush the seatpost with a big pair of grips and start stripping it out.

My bet's on that one Rich

 

[Norm]

I wouldn't take a saw anywhere near it. Partly because carbon dust is pretty icky, partly because a small slip and you've trashed the frame.

Crushing the tube and using a long metal screwdriver as a chisel would be my first thought, or hammering it into the frame, if using brute force is the plan.

However, I don't see how they can fuse. Carbon doesn't oxidise, so what's happened to get it stuck in there?

 

[Red Light]

However, I don't see how they can fuse. Carbon doesn't oxidise, so what's happened to get it stuck in there?

Reflow of the resin to conform with the inside of the seat tube, locking onto all the pits and scratches?

 

[Norm]

Really? Wow, I didn't think that would happen to any great extent over just a few years.

[flippant mode]I guess it wouldn't need to move much but it makes me wonder whether my Mclaren MP4 will be melted by the end of the decade. [/flippant mode]

 

[rich p]

I've read all googled threads on carbon/ali and it's not uncommon Norm. The answers appear to be soaking it with WD, Coke for a week and hoping that works or sawing or heating and trashing the paintwork.

It's fine for me but when my son and son in law come down they have to use my carbon bike as I can't raise the height on the alu Allez.

 

[Cubist]

Would drilling though the post laterally then inserting a rod to hammer it out be an option? I did exactly that to remove a jammed alloy seatpost only the other day. Drilled a 10mm hole through both sides, inserted an old axle then turned it upside down and hammered it out.

 

[Alun]

Rich it wasn't carbon frame but the doctor had a similar problem and I know he resolved it,can't remember how-might be worth a PM

Did he use a sonic screwdriver?

 

[biggs682]

i had one stuck in a reynolds steel frame a while and had it cut out be warned it took a whole day to do several cuts then carfully peel the strips out of the frame , a lot of hard work on what was a glorious bike .

have just sawn through a stuck handlebar stem to release the forks from the frame , so i can now cut the remains of that out .

 

[02GF74]

I had a carbon post stick inside an aluminium frame, not done too many miles or that old so it does happen - fortunately I was able to twist the post and after a lot of heaving got it out millimitre by miilimetre.

if I were you, I'd try using penetrating fluid and try twisting the post once more, use a scriber to brake any oxisitaionbetween the frame and the post to aloow the fluid to get in.

Depending on how much you value the frame, take it to fame builder specialist as they may well have tools to ream oiut the post, should be quite easy on carbon fibre, albeit messy.

also heat the tube so it expands - you can get quite hot 150-200 C before any damage to pain occurs

 

[PeterD]

Hi
For what its worth I've normally soaked the seat tube with WD40 or other similar oil for 24 hours then place seat post in a bench vice -- clamp it with frame upside down - then turn the frame as you will have plenty of leverage. Works 90% of the time.

 

[slowmotion]

I think that carbon fibre has a coefficient of thermal expansion that is about 10% that of aluminium. That means that if you put a hot air gun on the seat post, play it around gently, the aluminium will expand and create a gap. Squirt some WD40 into the gap to slush up the aluminium oxide that is acting like glue, and you could be on your way.

If not, there may be a small fire. Good luck.

 

[rich p]

I'll try the heat and WD40 method first.

The alternative is to buy another bike for the lads to borrow which is starting to sound like a good idea right now!