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seat post jammed in too far?

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seat post jammed in too far?

Old 05-22-15, 11:16 PM
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Chris Chicago
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seat post jammed in too far?

I have a late 80s raleigh m-50 mtb frame. it's small so I decided to build it up for my buddies 12yr old. i tried a few seat posts i had lying around and found one that seemed to fit. today it was removed ,reinserted and then I attempted to lower it farther than it had been before so that the seat height would work for him. it wouldn't go all the way down even with me sitting on the seat. now I can't get it out.

what should I do? the post will rotate a little back but won't raise. I felt along the seat tube for a bulge or something that might indicate I've jammed too big a post down the tube but it seems fine. my back is sore from trying to pull it out, and the seat is stuck in a position too high for the rider.

any advice much appreciated.
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Old 05-23-15, 06:09 AM
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Kopsis
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Shoot some penetrating oil (Kroil, PB Blaster, Liquid Wrench, etc.) into the seat tube. Then clamp the end of the seatpost in a bench vise and rotate the frame back and forth while pulling up. Pulling on the frame instead of the seatpost will give you much better leverage. As long as you can get some rotation, you'll be able to get it out.
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Old 05-23-15, 06:43 AM
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As you try to get the post out the friction will generate heat which will tend to cause additional binding. Take frequent breaks to let things cool down and the work will go easier. Be aware that clamping the post in a vise tightly enough will likely damage it and may render it unusable.
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Old 05-23-15, 07:46 AM
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& I know of 1 friend, recently, seat stays to seat tube brazing broke before the seat post came out,
But he persevered got the stuck seat post out, then brazed them back on..


Abundant stuck seat post threads about applying chemicals .. aluminum corrodes, steel rusts and the 2 surfaces intermingle..

perhaps removing the BB and turning frame upside down will let the chemistry pool in the underside of the Stuck seatpost.
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Old 05-23-15, 07:55 AM
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Chris Chicago
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Originally Posted by fietsbob View Post
& I know of 1 friend, recently, seat stays to seat tube brazing broke before the seat post came out,
But he persevered got the stuck seat post out, then brazed them back on..


Abundant stuck seat post threads about applying chemicals .. aluminum corrodes, steel rusts and the 2 surfaces intermingle..

perhaps removing the BB and turning frame upside down will let the chemistry pool in the underside of the Stuck seatpost.
yeah, i just thought since the post was out about 5min before it got stuck that it was a little different than a post that had been in the same spot for decades.. i'll let some pb blaster soak in and let you all know how it goes. thanks for the advice
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Old 05-23-15, 12:40 PM
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Sounds to me like it's a mechanical interference problem and not rust or corrosion that is keeping the seatpost in place.

I'm guessing that you jammed the end of the seatpost into the nuts for the bottlecages on the inside of the seat tube.

What is called for at this point is brute force to seperate the frame and the jammed seatpost. You could try clamping the seatpost in a mounted vice and holding the frame from the bottom bracket and yanking.
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