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

Seized seat post on a 2007/8 Giant XTC mountain bike

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.

Seized seat post on a 2007/8 Giant XTC mountain bike

Old 08-10-11, 01:29 PM
Thread Starter
Join Date: Aug 2011
Posts: 3
Likes: 0
Liked 0 Times in 0 Posts
Seized seat post on a 2007/8 Giant XTC mountain bike

I have recently bought a secondhand Giant XTC mountain bike. The bike is in very good condition indeed. [2008] However, the the seat post is completely solid and will not move, this despite the attentions of a local bike shop. The frame is carbon fibre and I'm reluctant to become too violent with it.

The seat will have to move up approximately 3/4 inches to achieve the ideal riding position. I would be grateful for any advice on how to sort things out. I thought of cutting the existing seat post and inserting a carbon fibre tube onto this, clamping it top and bottom. Does this seem a valid solution?
Angus530 is offline  
Old 08-10-11, 02:05 PM
Join Date: Jul 2011
Location: buffalo, ny
Posts: 25

Bikes: 1984 raleigh rapide

Likes: 0
Liked 0 Times in 0 Posts
Not too sure but you could spray the seam with wd-40, let it sit for a bit then put a rag on the post and try to twirling it out with vice grips. Be sure the grips aren't too tight tho. However this is coming from a novice so I would first wait for more responses
buffalangelo is offline  
Old 08-10-11, 02:23 PM
Senior Member
CACycling's Avatar
Join Date: Feb 2008
Location: Oxnard, CA
Posts: 4,571

Bikes: 2009 Fuji Roubaix RC; 2011 Fuji Cross 2.0; '92 Diamond Back Ascent EX

Liked 16 Times in 12 Posts
What is the seapost made of? It is hard to believe anything seized to CF. I'd be worried the former owner had problems with the seat post slipping and, instead of using carbon assembly paste, decided to use some form of adhesive. If the ID of the seat post is large enough and you can find a seat post to fit inside of it and use the existing seat post as a shim, that would be a possibility but you'd need to slit the remaining seat post inside the frame to allow it to clamp which, as it is surrounded by CF, is problematic as well.
CACycling is offline  
Old 08-11-11, 08:19 AM
Thrifty Bill
wrk101's Avatar
Join Date: Jan 2008
Location: Mountains of Western NC
Posts: 23,556

Bikes: 86 Katakura Silk, 87 Prologue X2, 88 Cimarron LE, 1975 Sekai 4000 Professional, 73 Paramount, plus more

Liked 1,004 Times in 645 Posts
Cut it out, VERY carefully. Tedious job at best, do not rush it. You may have bought a donor bike (pick up a nice used frame, and swap out the parts).

Last edited by wrk101; 08-11-11 at 01:23 PM.
wrk101 is offline  
Old 08-11-11, 09:48 AM
Join Date: Jun 2010
Location: NW,Oregon Coast
Posts: 43,598

Bikes: 8

Liked 1,360 Times in 866 Posts
Ridden hard and put away wet is hard on horses too..
fietsbob is offline  
Related Topics
Thread Starter
Last Post
High Fist Shin
Bicycle Mechanics
05-10-17 06:06 PM
Fitting Your Bike
06-14-14 05:13 PM
Bicycle Mechanics
05-29-14 04:55 PM
Bicycle Mechanics
03-11-11 05:04 PM
Classic & Vintage
07-06-10 07:24 PM

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Your Privacy Choices -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.