stuck seat post
 

Sheesh. I switched saddles on my IRO Angus, the new one had a higher profile, and when I went to adjust the seat post I found it totally frozen in the frame. I hadn't adjusted it in I guess close to a year, and have ridden many times in the rain, so all I can figure is that road sand and whatever slowly silted down between the post and frame. I tried squirting silicon down there several times (including when gently flexing open the seat tube with a screwdriver in the slot). I was able to rotate the saddle a little back and forth and so started trying to work everything up and out (standing on one pedal), when I realized I was only separating the head from the stem of the cheap seatpost. I wasn't moving the seatpost at all.

Any recommendations for a super solvent to try working in there, or other suggestions? Seatpost is anodized aluminum, frame is 631.

thanks!
 

Thanks! I'll get some ammonia and hopefully won't get to the hacksaw stage.

You could try chilling it. Aluminum will shrink much more than steel. If you hold a can of computer duster spray upside down it puts out pretty cold liquid...cold enough you should wear gloves so you don't get frostbite.

God what a mess. I feel for ya man.

First, try to break the adhesion by taking the saddle off and using a mallet to pound the seat tube maybe 1/8" into the post tube. A bit of grease on the collar of the tube might be to your advantage before you start pounding. Ya, wrong way. I know. Just break the corrosion adhesion. If you can't pound it down, I think you know what your chances are of pulling it out.

You can spray Liquid wrench, ammonia or whatever else you want. Good luck with that.

THEN, put a saddle back on the bike. A big saddle with a big nose and a cheap value will be best. Wrench that saddle onto the seat tube tight. Now, sit on the ground. Use your legs on the frame and use your arms to twist and pull on the saddle. If you do it outside on the grass, you save from scratching your bicycle and your floor.

This is the most effective way I have ever found for removing stuck seat posts. IF that doesn't work, we have probably thousands of posts like yours on this forum. Do a search and you will find every crazy idea on the planet - some which actually work.

Well the good news is the hackswa solution is 99.99999999999999% guaranteed to work.

A similar way worked for me a few years ago... so +1 on this reply.

But... make sure you use a wooden mallet, or a rubber one. You are aiming to break the binding between down tube and seat post, not destroy your seat post. You may still find once the you refit the seat tightly that you may be able to rotate it, but not remove it... some penetrating oil will hell there.