Go Back  Bike Forums > Bike Forums > Bicycle Mechanics
Reload this Page >

Tips on removing a stuck seat post

Notices
Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

Tips on removing a stuck seat post

Old 11-20-21, 08:32 AM
  #1  
Rob123
Member
Thread Starter
 
Join Date: Oct 2021
Location: Sussex, UK
Posts: 25

Bikes: Cannondale CAAD8, Giant, and many in bits

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked 2 Times in 2 Posts
Tips on removing a stuck seat post

Any tips or tricks. This seat post is locked solid.

I have tried brute force.
I have tried heating the post up.
I have managed to wedge a screwdriver in where the locking nut to the frame goes and open a little and still no success and run WD40 into and around it.
Still no joy!

Rob123 is offline  
Old 11-20-21, 09:20 AM
  #2  
HillRider
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Posts: 33,294

Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!

Mentioned: 39 Post(s)
Tagged: 0 Thread(s)
Quoted: 1839 Post(s)
Likes: 0
Liked 777 Times in 565 Posts
Do a search here as there have been numerous threads on this very subject. Good luck.
HillRider is offline  
Old 11-20-21, 10:40 AM
  #3  
Mr. 66
Senior Member
 
Mr. 66's Avatar
 
Join Date: Aug 2015
Posts: 2,272
Mentioned: 31 Post(s)
Tagged: 0 Thread(s)
Quoted: 716 Post(s)
Liked 780 Times in 473 Posts
I would put the saddle back on and use PB Blaster.

The last sat one I did I soaked with Blaster a couple of days, lay the frame front triangle over a flat ground hanging the rear free. I grabbed the frame top tube pulling up while stepping on the saddle tip. Do be careful though one can break or bend tubes in doing so.

The post on this one was frozen and slammed in at maximum insert.
Mr. 66 is offline  
Old 11-20-21, 11:47 AM
  #4  
Rolla
Victimless Criminal
 
Rolla's Avatar
 
Join Date: Sep 2020
Posts: 2,323
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 1022 Post(s)
Liked 2,435 Times in 1,088 Posts
Sheldon Brown: https://www.sheldonbrown.com/stuck-seatposts.html
Rolla is offline  
Old 11-21-21, 04:28 PM
  #5  
surveyor6
Senior Member
 
surveyor6's Avatar
 
Join Date: Jan 2021
Location: Houston area
Posts: 246

Bikes: 1961 Higgins Flightliner

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 68 Post(s)
Liked 100 Times in 69 Posts
Cut off the top of the seat post.
-Take a hacksaw blade and begin sawing the inside of the seat post (up and down) with your hand.
-After cutting through the seat post, use channel locks or vice grips to scroll the seat post and pull it out.
-its slow and tiring, but it works.
surveyor6 is offline  
Old 11-21-21, 05:01 PM
  #6  
Trakhak
Senior Member
 
Join Date: Jan 2005
Location: Baltimore, MD
Posts: 3,188
Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 1160 Post(s)
Liked 1,048 Times in 610 Posts
Before you folow any of the more invasive and time-consuming suggestions, take it to your local auto repair shop and have a mechanic use a heavy-duty pneumatic hammer on the underside of the saddle clamp of the seatpost. Ten seconds and done.

Note: don't clamp the frame in a fixture first---just hold the frame up by hand while the pneumatic hammer is slamming the saddle clamp. Clamping the frame solidly will absorb most of the impact, rendering the air hammer less effective, and might result in damage to the frame.
Trakhak is offline  
Old 11-21-21, 05:05 PM
  #7  
curbtender
Senior Member
 
curbtender's Avatar
 
Join Date: Mar 2007
Location: SF Bay Area, East bay
Posts: 7,424

Bikes: Marinoni, Kestral 200 2002 Trek 5200, KHS Flite, Koga Miyata, Schwinn Spitfire 5, Schwinn Speedster, Mondia Special, Univega Alpina, Miyata team Ti, MB3

Mentioned: 44 Post(s)
Tagged: 0 Thread(s)
Quoted: 1173 Post(s)
Liked 1,061 Times in 619 Posts
There are a ton of videos on this. Be patient or you may damage the frame. Last one I got out with two large crescent wrenches under the seat clamp. Helps to have someone hold the frame. You can turn upside down and spray down the seat tube also.
curbtender is offline  
Likes For curbtender:
Old 11-21-21, 05:44 PM
  #8  
SquishyBiker
Senior Member
 
Join Date: May 2020
Location: Auckland, NZ
Posts: 103

Bikes: 2014 Avanti Circa (Rd Dist), 2020 Giant Toughroad (Rd Tour), 2021 Trek Allant+ 8S (eCommute), 2021 Scott Aspect 940 (Mt HT), 2014 Santa Cruz Superlight 29er (Mt FS), 2022 Scott Spark 960 (Mt FS)

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 32 Post(s)
Liked 49 Times in 25 Posts
Originally Posted by curbtender View Post
You can turn upside down and spray down the seat tube also.
This. I would hang the frame upside down, and if you have some bottle cage bosses, take the bolts out and spray WD40 or something similar inside the bolt hole (otherwise take the BB out and spray from there) - hopefully the WD40 will soak in from the bottom of the seat pole...
SquishyBiker is offline  
Old 11-21-21, 07:39 PM
  #9  
andrewclaus
Senior Member
 
Join Date: Feb 2012
Location: Golden, CO and Tucson, AZ
Posts: 2,452

Bikes: 2016 Fuji Tread, 1983 Trek 520

Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 560 Post(s)
Liked 374 Times in 255 Posts
WD-40 is not a good penetrant. Read the Sheldon Brown article.
andrewclaus is offline  
Old 11-22-21, 04:16 AM
  #10  
Rob123
Member
Thread Starter
 
Join Date: Oct 2021
Location: Sussex, UK
Posts: 25

Bikes: Cannondale CAAD8, Giant, and many in bits

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 9 Post(s)
Liked 2 Times in 2 Posts
Thanks, friends - I may try a combination of these suggestions and order some PB Blaster and see if that does the trick.
Rob123 is offline  
Old 11-22-21, 06:06 AM
  #11  
mikethe
Member
 
Join Date: Nov 2021
Posts: 28
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
Liked 0 Times in 0 Posts
Wd40?
mikethe is offline  
Old 11-23-21, 04:04 AM
  #12  
Gym123456
Senior Member
 
Join Date: Nov 2021
Posts: 52
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Likes: 0
Liked 7 Times in 5 Posts
Heating the post causes the post to expand and that makes it more difficult to remove. If you can get some freeze mist (used for rapidly cooling electronic components) , spray it inside of the post liberally after letting some good penetrant soak in (CRC, PB Blaster, etec) and give it a twist/pull, whatever. You could also try using dry ice, but be careful to avoid freezing your fingers.
Gym123456 is offline  
Old 11-23-21, 06:57 AM
  #13  
fishboat
Senior Member
 
Join Date: Feb 2016
Location: SE Wisconsin
Posts: 1,498

Bikes: Lemond '01 Maillot Jaune, Lemond '02 Victoire, Lemond '03 Poprad, Lemond '03 Wayzata drop bar conv(Poprad), '79 AcerMex Windsor Carrera Professional(purchased new), '88 GT Tequesta(purchased new), '01 Bianchi Grizzly, 1993 Trek 970 drop bar conv

Mentioned: 9 Post(s)
Tagged: 0 Thread(s)
Quoted: 561 Post(s)
Likes: 0
Liked 490 Times in 291 Posts
If you're using wd40 then I'd guess you haven't done much..or any research on the issue. A quick search is your friend as this topic has had a lot of discussion.

This thread was within the last week..
Thickest, stuckest seat post
fishboat is offline  
Old 11-23-21, 04:24 PM
  #14  
rydabent
Senior Member
 
rydabent's Avatar
 
Join Date: Apr 2010
Location: Lincoln Ne
Posts: 9,349

Bikes: RANS Stratus TerraTrike Tour II

Mentioned: 35 Post(s)
Tagged: 0 Thread(s)
Quoted: 2668 Post(s)
Liked 862 Times in 503 Posts
Remove the BB and pour a mixture of automatic transmission fluid and naptha down the tube with frame upside down. Wrap the frame in rags and pour hot water on them while twisting the seat.
rydabent is offline  
Old 11-23-21, 04:46 PM
  #15  
dedhed
SE Wis
 
dedhed's Avatar
 
Join Date: Apr 2005
Location: Milwaukee, WI
Posts: 8,913

Bikes: '68 Raleigh Sprite, '02 Raleigh C500, '84 Raleigh Gran Prix, '91 Trek 400, 2013 Novara Randonee, 1990 Trek 970

Mentioned: 32 Post(s)
Tagged: 0 Thread(s)
Quoted: 2091 Post(s)
Liked 2,061 Times in 1,281 Posts

dedhed is offline  
Old 11-25-21, 08:12 PM
  #16  
bikemike73 
Senior Member
 
Join Date: Mar 2016
Location: North of Boston
Posts: 648

Bikes: 1973 Schwinn Sports Tourer plus a " few" more :)

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 152 Post(s)
Liked 117 Times in 96 Posts
I wish they made the part already with the holes drilled.

Many would buy it !!😁😁
bikemike73 is offline  
Old 11-26-21, 05:39 AM
  #17  
Gym123456
Senior Member
 
Join Date: Nov 2021
Posts: 52
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 21 Post(s)
Likes: 0
Liked 7 Times in 5 Posts
A couple of issues I saw in this video-

The drill bit is too long to be safe. I have a scar in my bicep from a drill bit that fractured as it was being used to drill a hole in a wooden garden tool handle- they really don't like to bend much unless they're crap.

The seat tube is split at the rear and has the two bosses for the bolt- this can be carefully/easily spread a bit, to allow creating a small gap between the tube and seat post and the penetrant will seep in better.

This bike was abused and not well maintained, as many are but a very clean bike can have a stuck seat post because of dissimilar metals. This is one of the reasons I don't like washing a bike with water-based cleaners and flushing with fresh water- it's hard to dry it completely before corrosion sets in and with Aluminum being such a reactive metal, it's even more important to dry it and use an anti-corrosion chemical.

The seat needs to be removed periodically and some anti seize compound added as a regular maintenance step.
Gym123456 is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.