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  1. #1
    Senior Member adxm's Avatar
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    siezed carbon seat post/carbon frame

    I went to adjust my seat height a tad the other day, and to my dismay found that the seat post wouldn't budge. I know carbon is more finnicky and can be more fragile than other materials and haven't been able to find any advice particularly pertaining to a siezed carbon part. What should I do?

  2. #2
    Senior Member Matt Gaunt's Avatar
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    Tough one. The clamped part of the frame needs the tension to be released I guess. Take the bolt completely out and then try to GENTLY coax the frame away from the seat tube. Personally I'd take it down to an LBS and get some pro advice before I meddled though.
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  3. #3
    Senior Member RockyMtnMerlin's Avatar
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    Did you ever put any grease on it? Velonews recently had an article on how some greases can cause part of the makeup of the CF to fuse to other CF parts. Unfortunatley they did not discuss how to deal with the problem if it ocurred. Sorry to hear about your predicament.

  4. #4
    Banned wagathon's Avatar
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    Quote Originally Posted by RockyMtnMerlin
    Did you ever put any grease on it? Velonews recently had an article on how some greases can cause part of the makeup of the CF to fuse to other CF parts. Unfortunatley they did not discuss how to deal with the problem if it ocurred. Sorry to hear about your predicament.
    You are not supposed to use any grease at all: it breaks down the carbon like a solvent.

  5. #5
    Senior Member RockyMtnMerlin's Avatar
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    Quote Originally Posted by wagathon
    You are not supposed to use any grease at all: it breaks down the carbon like a solvent.
    Yes, I know. By the way I also read through that Sheldon Brown piece on stuck seatposts, no mention of CF parts.

  6. #6
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by RockyMtnMerlin
    Yes, I know. By the way I also read through that Sheldon Brown piece on stuck seatposts, no mention of CF parts.
    I do not recommend plastic seatposts or forks with plastic steerers.

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  7. #7
    Senior Member RockyMtnMerlin's Avatar
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    Quote Originally Posted by Sheldon Brown
    I do not recommend plastic seatposts or forks with plastic steerers.

    Sheldon "Metal Is Good" Brown
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    Hey Sheldon: How about that plastic helmet you are wearing?

  8. #8
    LF for the accentdeprived
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    That Peter Chisholm quote is pretty silly. Based on that thinking, you can only save weight on bottle cages... If something breaks anywhere ese, it's gonna hurt. Frame, fork, wheels, drivetrain, bars, whatever.
    It just has to be good stuff for the use, that's all.
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  9. #9
    Banned wagathon's Avatar
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    Quote Originally Posted by Sheldon Brown
    I do not recommend plastic seatposts . . .

    [/CODE]
    Are you saying put an aluminum seatpost on a CF frame? Why not? My CF seatpost is so slick that is slid on me more than once. I think I'll try that. Thanks for the tip.

  10. #10
    Pro wheelbuilder UK
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    You need three people. One to pull gently on the seatpost end, one to pull gently on the frame at the same time and the third to hold the junction where the post goes into the frame. The third person rotates the junction in a circle while the other two pull gently and continually and the seatpost will gradually release itself and the two parts will come apart. Don't try twisting!!! Carbon will object to that in a terminal way.
    This is the way fishing tackle shops in the UK seperate carbon fibre fishing poles when two sections have been stuck together. Dirt gets between the post and the frame- thrown up by the rear wheel and causes the siezing.

  11. #11
    Senior Member Nessism's Avatar
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    Many carbon seatposts use a clear paint on top of the substrate to make it look pretty. Unfortunately, the paint can act like glue to stick that bad boy down inside the frame. I don't think chemical assistance is going to help; the frame may get damaged.

    First step is to twist/pull up on seat while holding down frame.

    Second step is to clamp the seat post in a vice with the frame upside down and spin the frame around.

    Third step is to cut out the seat post with a hack saw blade.

    Good luck.

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  12. #12
    Senior Member adxm's Avatar
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    Quote Originally Posted by wrench
    You need three people. One to pull gently on the seatpost end, one to pull gently on the frame at the same time and the third to hold the junction where the post goes into the frame. The third person rotates the junction in a circle while the other two pull gently and continually and the seatpost will gradually release itself and the two parts will come apart. Don't try twisting!!! Carbon will object to that in a terminal way.
    This is the way fishing tackle shops in the UK seperate carbon fibre fishing poles when two sections have been stuck together. Dirt gets between the post and the frame- thrown up by the rear wheel and causes the siezing.
    OK. I think I'll take it to a bike shop and have them help me try this. I think you're spot on about the dirt between post and frame: there's some grit on the seatpost right above the frame from a few rides where I got stuck in the rain...must have gotten in there and wreaked havoc.

    Thanks for the advice everyone!

  13. #13
    Senior Member Old Hammer Boy's Avatar
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    I can't make this recomendation from experience, but I wonder if a hair dryer around the seat stay might free things up, like gummy paint, or just expand things enough to free it up. At least worth a try, wouldn't you think? Let us know what works for our future knowledge.

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