Carbon Fiber Seat Post - Stuck
01-15-15, 07:01 AM
#1
Senior Member
Thread Starter
Join Date: Mar 2010
Location: Alpharetta, GA
Posts: 2,982
Bikes: LESS than I did a year ago!
Mentioned: 17 Post(s)
Tagged: 0 Thread(s)
Quoted: 70 Post(s)
Likes: 0
Liked 6 Times
in
5 Posts
Carbon Fiber Seat Post - Stuck
I know that there has been a lot posted here about getting stuck seat posts out. I do not want to reinvent the wheel there. I was searching...and, if it is there, I did not find it...about anything specific to a CF to Steel stuck post. Basically, I have a steel bike that has a CF seat post stuck in it. Is there any "do not do's" or "do this instead's?" I have successfully used PB Blaster on steel to steel...and other penetrating oils as well. I have also used those in conjunction with pretty much brute force...and then there was the one that I started to cut out...
But...can PB Blaster be used on CF? Does it work?
Brute force...can that work...or will the CF fail?
Any help is very much appreciated...
But...can PB Blaster be used on CF? Does it work?
Brute force...can that work...or will the CF fail?
Any help is very much appreciated...
01-15-15, 08:21 AM
#2
Senior Member
Join Date: Feb 2012
Location: Rochester, NY
Posts: 18,100
Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 4212 Post(s)
Liked 3,883 Times
in
2,318 Posts
What's it matter if the post is sacrificed during removal? How deep in the frame does it go? Andy.
01-15-15, 10:47 AM
#3
Senior Member
PB Blaster helps with steel corrosion (rust) and won't hurt carbon fiber. I'd let that soak first for a while and also hit it from the bottom bracket shell or water bottle holes in the seat tube.
Heat will expand the steel. Some will argue it could weaken the carbon fiber, but if you're not setting the frame's paint on fire, I doubt it'll be an issue.
Heat will expand the steel. Some will argue it could weaken the carbon fiber, but if you're not setting the frame's paint on fire, I doubt it'll be an issue.
01-15-15, 10:56 AM
#4
Calamari Marionette Ph.D
01-15-15, 11:04 AM
#5
Senior Member
If you've got a repair stand, put the bike in upside down, unscrew one of the water bottle bolts on the seat tube and spray a bunch of PB Blaster or similar in there with the little straw. It'll help reach parts that might not get hit if you just spray from above.
The water bottle bolt hole is easier than taking off your crank and bottom bracket, but that's another way to spray the inside of your seat tube.
The water bottle bolt hole is easier than taking off your crank and bottom bracket, but that's another way to spray the inside of your seat tube.
01-15-15, 11:14 AM
#6
Calamari Marionette Ph.D
If you've got a repair stand, put the bike in upside down, unscrew one of the water bottle bolts on the seat tube and spray a bunch of PB Blaster or similar in there with the little straw. It'll help reach parts that might not get hit if you just spray from above.
The water bottle bolt hole is easier than taking off your crank and bottom bracket, but that's another way to spray the inside of your seat tube.
The water bottle bolt hole is easier than taking off your crank and bottom bracket, but that's another way to spray the inside of your seat tube.
01-15-15, 01:40 PM
#8
Senior Member
Join Date: Jul 2010
Location: South Central PA
Posts: 972
Bikes: Cannondale Slate 105 and T2 tandem, 2008 Scott Addict R4, Raleigh SC drop bar tandem
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 22 Post(s)
Likes: 0
Liked 1 Time
in
1 Post
I have had this issue in the past. You can try whacking down on the seat to see if you can get it to move at all. If it does go down a bit, then work on pulling and twisting back out. If it never moves and you have to destroy the seat post to remove it, then put the post in a vise and twist the bike around it while tugging. One of my carbon posts had a steel ring in it that bonded to the seat tube. Took a reamer to get it cleared out and some of the post remained.
