Seat post removal

For discussions about bikes and equipment.
Colin Stanley
Posts: 305
Joined: 12 May 2007, 7:05pm
Location: Somewhere in Kent

Seat post removal

Postby Colin Stanley » 11 Jul 2018, 10:45pm

OK, I have a steel framed bike (725) with a stuck ally seat post. I am preparing myself for a slow, steady, long hacksaw cut inside the ally post to release it. I have done this on a steel frame some years ago, but wonder if there is a quicker way of 'sensibly' removing the seat post.
The bike which is 2 years old has been in in a 'wet' shed for some time and the seat post is really stuck. I have applied GT85 to the post but it refuses to move. I imagine that a 725 steel frame tube is a lot thinner, so I must be very caerful?
Suggestions please

User avatar
gaz
Posts: 12838
Joined: 9 Mar 2007, 12:09pm
Location: Kent

Re: Seat post removal

Postby gaz » 11 Jul 2018, 10:56pm

Read this thread.

richardfm
Posts: 7
Joined: 15 Apr 2018, 3:17pm

Re: Seat post removal

Postby richardfm » 11 Jul 2018, 10:58pm

Rather than gt85 try a penetrating/releasing fluid such as Plusgas. Be prepared to take a few days, squirting some more in every day and giving it time to work

Ke1th
Posts: 5
Joined: 11 Jul 2018, 7:54pm

Re: Seat post removal

Postby Ke1th » 11 Jul 2018, 11:15pm

Do you need to move it? If it's correct height for you I'd leave it be.Save a lot of hassle.

KM2
Posts: 243
Joined: 23 Oct 2008, 5:38pm

Re: Seat post removal

Postby KM2 » 11 Jul 2018, 11:33pm

If the frame has brazed on seat bolt attachments it could be quite easy. If the frame uses a seat tujbe clamp, good luck with the cutting.

Colin Stanley
Posts: 305
Joined: 12 May 2007, 7:05pm
Location: Somewhere in Kent

Re: Seat post removal

Postby Colin Stanley » 12 Jul 2018, 5:41pm

Thanks for all the replies.
Ke1th wrote:Do you need to move it? If it's correct height for you I'd leave it be.Save a lot of hassle.

Yes, there is a need to lower the seat a bit for safety as a childs seat is being installed via a seat tube bracket and those two prongy things, can't remember the name of it.
I will try the Plusgas route first and then ice cubes and hairdryer.
The last time I hacksawed a seat post it took forever, just to be careful.

9494arnold
Posts: 604
Joined: 21 Jan 2007, 3:13pm

Re: Seat post removal

Postby 9494arnold » 12 Jul 2018, 7:20pm

More hassle but if you strip the bottom bracket and put the bike upside down and introduce the plus gas from there you will stand more chance of the plus gas getting where it needs to to release the post. And have a look at the Sheldon Brown blog on this.

fastpedaller
Posts: 1402
Joined: 10 Jul 2014, 1:12pm
Location: Norfolk

Re: Seat post removal

Postby fastpedaller » 12 Jul 2018, 10:37pm

you may be able to put it in (again with bike upturned) through bottle cage securing threads thus avoiding bb removal?

Colin Stanley
Posts: 305
Joined: 12 May 2007, 7:05pm
Location: Somewhere in Kent

Re: Seat post removal

Postby Colin Stanley » 15 Jul 2018, 8:49am

Yes, thanks for that. I will try the bottle cage threaded holes route and the BB as well as the Chainset is out already.