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 Post subject: Stuck seat post?
PostPosted: Thu Jul 16, 2020 3:14 pm 
Newbie

Joined: Thu Jul 16, 2020 2:55 pm
Posts: 4
Hello I just got hold of an old vintage road bike that might or might not become a project for the months to come.

To my surprise I notice what it seems like a stuck seat post inside the frame.

However it is at least 9-10 cm deep inside the tube and does not prevent the new seat post from sliding in. My questions for you:

a) how the heck have they managed to do that??
b) is there a way to remove it? I‘ve seen plenty of advice on how to remove a ‘traditional’ stuck seat post but in this case I cannot tell whether it will be more or less difficult!

I included some pictures for reference! Thank you!


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 Post subject: Re: Stuck seat post?
PostPosted: Thu Jul 16, 2020 3:22 pm 
Retro Guru
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Joined: Thu May 17, 2012 11:04 am
Posts: 950
Location: manchester
Caustic soda method. The tube will need reaming as it has deformed from previous attempts at removing the post.


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 Post subject: Re: Stuck seat post?
PostPosted: Thu Jul 16, 2020 4:54 pm 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 10221
Location: New Forest, UK
I agree, no way you'll ever get a tool in there to remove it. And reaming will be essential to get any replacement seatpost to stay put.


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 Post subject: Re: Stuck seat post?
PostPosted: Thu Jul 16, 2020 6:08 pm 
Old School Hero

Joined: Wed Sep 06, 2017 5:38 pm
Posts: 222
Zagor wrote:
a) how the heck have they managed to do that??


Wiv u ammer (and not many grey cells).


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 Post subject: Re:
PostPosted: Thu Jul 16, 2020 6:17 pm 
Retro Guru

Joined: Wed Dec 10, 2008 9:19 am
Posts: 2674
The tube looks deformed which will continue to present seatpost problems.
Edit - Someone above has already said that, must read properly next time


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 Post subject: Re: Stuck seat post?
PostPosted: Thu Jul 16, 2020 11:40 pm 
r.B.o.T.M. & P.o.T.M. Winner
r.B.o.T.M. & P.o.T.M. Winner
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Joined: Thu Nov 22, 2007 10:51 am
Posts: 2690
Location: Camel Land
Unless it is sentimental to you or some kind of rare frame Worth the time & effort... personally I wouldn’t bother & look for something else....of course you can experiment by chucking down various chemicals down the seat tube & see what happens :)


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 Post subject: Re: Stuck seat post?
PostPosted: Thu Jul 16, 2020 11:49 pm 
Retro Guru
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Joined: Sat Apr 18, 2020 6:24 pm
Posts: 322
Probably not worth it with the deformities around the seat tube. But caustic soda is an entertaining experiment to get rid of any nasty aluminium. I recently used to remove a very thick and long stuck seat post, what you've got in there is like a light lunch for the caustic soda. Pour it in and listen to the beautiful sizzle while you crack open a beer or two. Therapy. Just remember to wear PPE and don't drink too many beers.


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 Post subject: Re: Stuck seat post?
PostPosted: Fri Jul 17, 2020 1:32 am 
Dirt Disciple

Joined: Wed Apr 01, 2020 11:08 pm
Posts: 15
Caustic soda will only work if the seatpost is made of aluminium.
Just reaming would leave you with no lug wall.

Get a long hacksaw blade and attach it to a wooden handle and approach the task slowly and carefully.
To reform the seat lug support it properly and hammer it gently and gradually with a hardwood drift and something like a one inch socket inside it, changing the size of socket as the shape returns. Or put it in vice grips and form it from within.


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 Post subject: Re: thank you
PostPosted: Fri Jul 17, 2020 1:27 pm 
Newbie

Joined: Thu Jul 16, 2020 2:55 pm
Posts: 4
Thanks guys a lot of useful (and entertaining) opinions!

My view at the moment:

After a quick research on the internet caustic soda method feels a bit too dangerous, plus I’m not sure if it’s aluminium or steel. Maybe I’ll do it if I get bored and just to see what happens. At the moment it is causing no problem so it can stay there.

Reaming: at the moment the seatpost is pretty solid but will probably give it a try if not too complex. I would be great if anyone has got a link to a nice tutorial / description of the process

Thanks and have a great weekend!


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