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Old 12-31-01, 05:03 PM   #1
mike
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Seatpost is stuck

I received a used pain-in-the-@ss mountain bike that needed an entire overhaul. Oh, why did I even bother?....

Anyway, the final step is the seat-post. It is stuck like Lucifer in hell. I have tried absolutely everything; lubricating oil, heat, placing the seat post in a vice - the works.

The problem is that some IDIOT pounded the too-big seat post into the post tube (Don't ever do this). The post tube has a slight tell-tale bulge.

Anyway, it isn't coming out. No way.

The OD of the seat tube is 27.7 mm. What can I do? Can I cut the tube off, cut a slit along the post-tube slit, and insert another tube? Is this practical?

Are there tubes I can buy that will go over the 27.7 mm tube?

If you have been through this yourself, you know the frustration.
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Old 12-31-01, 08:30 PM   #2
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Sorry about that, Mike! Is the seat post aluminum or steel? Have you tried running a drill bit or hacksaw blade parallel to its axis, to cut a groove down the post? Your bike's previous owner is what we used to call a ZMA (Zero Mechanical Aptitude) at Bikecology/Supergo. If you ever do get that post out of there, be sure to check the seat tube and seat stay cluster for cracks.
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Old 12-31-01, 08:50 PM   #3
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Cut the seat post off to the frame, and duct tape a bath towel over it......voila you've got a seat! LOL
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Old 12-31-01, 09:24 PM   #4
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I never had it that bad, but it will come out. I think the hacksaw idea is your ace in the hole.

Did you pick up the Schwinn or the Giant?
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Old 12-31-01, 11:28 PM   #5
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yea is that the schwinn or giant?
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Old 01-01-02, 01:33 AM   #6
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Have you tried smacking it with a large hammer? You might drive it in slightly farther, but it might break it loose if it is gaulded(sp?) to the tube. Just a thought.
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Old 01-01-02, 05:16 AM   #7
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Turn the bike upside down and pour some anti-freeze down into the tube and and let it soak for a while. If you think this is radical, I agree, and old-time frame bulider told me about it and I haven't had to try it yet. I've done the same with penetrating oil and done OK, so far.

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Old 01-01-02, 06:31 AM   #8
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Mike,
How far into the seat tube is the post inserted? One near-last-resort measure that might be a possibility is to cut the top off the seatpost (if necessary) and try to use a hacksaw blade from the inside to cut a slot in the post. It would take a while, but it might work without further damage to the seat tube. You could start the slot in the exposed part with a Dremel tool and emery discs, leaving only the inserted part for the hard sawing. I would leave 2-3 inches of seat post exposed to allow for other efforts if this proves impractical.

A machine shop might have tools for getting things apart. If you know someone they might even do it free.
Good luck,
Raymond
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Old 01-01-02, 08:04 AM   #9
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Quote:
Originally posted by John E
Sorry about that, Mike! Is the seat post aluminum or steel
The frame and the seat-post are steel. John brings up an important point here, folks. An aluminum post in a steel frame will weld together over time to the point that it is almost impossible to get out.

Sheldon Brown (Cool Sheldon) on his "15 ways to remove a stuck seat-post" site recommends using ammonia on aluminum oxide. He says it just washes away the oxidation.
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Old 01-01-02, 08:11 AM   #10
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Quote:
Originally posted by Oscar
I never had it that bad, but it will come out. I think the hacksaw idea is your ace in the hole.

Did you pick up the Schwinn or the Giant?
Actually, it is the Giant, but I am going to get the Schwinn too. I can't pass up the Schwinn - Schwinn's are in my blood.
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Old 01-01-02, 08:13 AM   #11
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Quote:
Originally posted by Dirtgrinder
Have you tried smacking it with a large hammer? You might drive it in slightly farther, but it might break it loose if it is gaulded(sp?) to the tube. Just a thought.
Yup, I tried the hammer idea. It wouldn't move. That is when I noticed the bulge in the frame and realized that some ZMA (As JohnE identifies above) pounded the post into the frame.
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Old 01-01-02, 08:18 AM   #12
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Quote:
Originally posted by RainmanP
Mike,
How far into the seat tube is the post inserted? One near-last-resort measure that might be a possibility is to cut the top off the seatpost (if necessary) and try to use a hacksaw blade from the inside to cut a slot in the post.
Raymond
Ya, this is the "last resort" which Sheldon mentions at his site.

inserting a hack-saw blade into the tube and manually trying to cut it vertically seems like it would take about 3 years with a hack-saw blade give or take six months. Maybe if I was stranded on a deserted island with nothing else to do this would seem more appealing.
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Old 01-01-02, 09:47 AM   #13
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Mike, with a course blade (18t) you should be able to do it in less than an hour.
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Old 01-02-02, 12:24 PM   #14
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Well, guys, here is what I did - and it worked famously;

I cut off the stuck post except for about 2" - leaving room for the next ambitious owner who might want to try his/her hand at getting the seat-post out.

Then, using a drill mounted disc cutter, I sliced the stuck seat-post vertically along the tension-slit in the post-tube.

Then, I slipped a smaller diameter seat-post inside the stuck post.

The new seat-post O.D. was almost the same diameter as the stuck post I.D.

With a shim, it fits pretty well. I rode the bike to work today and all is well thus far.

That was silly. I spent three days rebuilding the whole bike, replacing parts, and doing paint touch-up. When I went to give it a test ride, I discovered the seat post was helplessly stuck.

Next time, I'll check the seat-post first.

Remember, Folks:

1) NEVER EVER pound a seat-post into a post-tube.

2) Be sure your post-tube has a thin coat of grease to protect it from corroding to the seat post.
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Old 01-02-02, 08:15 PM   #15
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You might want to try to cut the post and leave appox 3" above the seat tube. I have an automotive errentic tool that fits into the post and if it grabs it would turn the post.
Or you can cut the post on the inside and remove a peice of it. This would lessen the pressure to try and remove it.
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Old 01-02-02, 09:30 PM   #16
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If you do decide to cut it out an electric jigsaw with a long metal cutting blade could cut the inside of the post in fairly short order.
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Old 01-03-02, 10:49 AM   #17
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Try drilling a hole crossways and then you could insert a pin. Tapping with a hammer might just loosen the bar, otherwise fit the whole caboosh in a mighty vise and try twisting the frame...
It's an idea

R
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Old 01-03-02, 11:31 AM   #18
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Quote:
Originally posted by Harry
Try drilling a hole crossways and then you could insert a pin. Tapping with a hammer might just loosen the bar, otherwise fit the whole caboosh in a mighty vise and try twisting the frame...
It's an idea

R
Ya, I tried that too. It didn't work.

Sheldon Brown brings up a good point in his "15 ways to remove a stuck seat post". He recommends not turning posts that have been pounded into the seat tube because it could act like a cam and make it even more stuck than before.
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Old 01-08-02, 12:10 PM   #19
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I got my stuck seatpost out on Sunday while watching the football game. I cut the post off about an inch above the top of the seat tube. then using a hacksaw blade held in my hands, I cut the tube inside lengthwise. It took a little over half an hour and was much easier than I thought it would be.
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