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Seeing as I bought the bike last summer and didn't have to do too much to make it fit me, I have never tried to move the seat post until today. It is stuck as, well, something that rhymes with stuck.
Any ideas as to how I might free it? The collar loosens with no problem; it is just they the seat post will not move a bit.
Depends how stuck it is, try riding it without the seat clamp tightened.
I had one that I left undone, lubed & used the seat as a lever to twist it, over the cause of a week it came loose
There's a carbon anti-sieze spray, [url= http://road.cc/content/review/59182-effetto-carbo-move ]this stuff[/url] that I've used in the past that worked for me, though I guess it depends just how well stuck it is.
I also half remember an internet article somewhere about it being better to pull the frame off the post rather than the other way round*, though that may be some sort of hallucinatory thing I dreamed once upon a time...
* Edit: [url= http://sheldonbrown.com/stuck-seatposts.html#carbon ]this[/url]
Post seized due to aluminium oxide build-up caused by galvanic corrosion. ACF50 will dissolve the oxide
Would carbon cause galvanic corrosion? Couldn't the Carbon soak up the ACF 50 and swell up even more?
As the frame is the metal part in this problem I'd be tempted the saw the top off the post and use a hacksaw blade holder, or a drywall saw and attack the seat post, carbon will be a doddle to cut and leave the alloy untouched.
As a parting comment I would still put a crap seat in the post, put the seat in a vice and rotate the frame before getting the saws out.
From experience, whatever it is, it deeply pitted my alloy post that was seized solid in a c456 carbon frame. At least once I finally got it off.
I posted elsewhere the other day on a question about posts stuck in c456, that I finally got it loose by soaking in ski/snowboard base cleaner. It's basically a citric solution.
It also required a huge amount of rotational force and took a long time with a lot of swearing and a lot of noise.
Once removed, when refitting or fitting new post, use carbon assembly paste. Doesn't have to be a carbon post, it just reduces clamping force required plus provides a barrier to potential corrosion.
Another thing to note is I'm not finding dropper posts sticking. Reason being I think is that with my fixed alloy post I was frequently manually dropping the post and that wore off the annodising/paint/whatever and was exposing the bare metal to the carbon. My dropper posts retain the finish which perhaps helps.