Removing a seized seatpost

Jason....NEVER tap down on a seized seatpost that you know nothing about.

There are a few reasons it could be seized, but most are caused by two things. Inserting it wrong or forcing the wrong size in.

So if you tap down and it is the wrong sized post...you are going to end up splitting a frame

Have you tried tapping it down a little to free it? I have had to do this a few times on restorations, cut the post near the top so you can get a piece of broom or dowel for extra support, get a good grip with vice grips, gently tap down while twisting.

As far as the cause of this, assuming its both aluminium parts fused together by oxidisation, if I remember Phosphoric Acid will dissolve it, but I dont know what else it will do, but coke has Phos as an ingredient, you could try a bit if you get some movement, dont know if it will be strong enough, but you have nothing to loose

Talking of penetrating fluid, WD40 is pretty useless, Plus Gas is as good as it gets.

Had this before. Solved it by sawing off the post about 50mm above the seat tube top. I made a handle for a power hacksaw blade out of 30mm dowel, taped together. Then htfu and cut the tube lengthways down the tube! Took about 1 day, lots of penetrating fluid, lots of effort, then got a set of molegrips and twisted the end round. Nothing's ever easy,but it came out!

Slide hammer attached to the top of the tube. I used one on a seized motorcycle suspension linkage. Nothing would remove a seized shaft, heat lubrication or prying. But fitting a slide hammer in the direct plane of pull, slowly worked. A completely rusted shaft removed after 30 mins of work

Get them from any decent automotive hardware centre for not alot.- the company that sells clarke products

Always try and twist it out, don't try and pull up or push it down.

Once you get it twisting, give it a pull up, if it comes out first time, prefect, if not, put some oil down and keep twisting.

If you have tried this already with the saddle, fine, but with a bar through the seat post as close to the frame as possible, that will give you much better torsion compared to the saddle method.

Oh fun and games.....

If you have tried EVERYTHING possible and the LBS have tried it, then it is a case of cutting it out.

I'm trying to think, does the allez have a small hole underneath the seat clamp?

That is your best bet for getting it out. There are MANY ways to get it. I would go on as low as you can in the seatpost with a drill. If the frame does not have a little notch then go in as close to the frame as possible without touching the frame.

Start with a small drill bit, put a hole in BOTH sides and go up in size. Until a point you can put a something sizeable through, a like piece of round bar.

Get someone to sit on the frame to keep it held down, while you take each end of the round bar or similar and twist and turn it, until the seatpost comes loose.

If this does not make sense. I could make a simple video for you, I have a couple of old frames with stuck seatposts in the workshop ready to be scrapped.