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  1. #1
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    Reputation: azorr's Avatar
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    Seatpost damage question

    I noticed that my seatpost is being dented/flattened on the back right where the clamp is at (insert fat joke here). I have a 2008 Marin Pine Mountain frame, it is steel with a brazed on post clamp, no collar other than the frame itself. I have not had this problem on my old bike, I am curious is this damage to the frame I have or just typical of this type of clamp. Is there something that I can do or have done to prevent it from happening? possibly ream the tube or remove the brazed on clamps and use a regular seat collar?

  2. #2
    Ahhh the pain....
    Reputation: Raybum's Avatar
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    Maybe post up a picture...kinda see what you're saying but a pic would help a bunch.
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  3. #3
    Pivotal figure
    Reputation: kenbentit's Avatar
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    Could just be the post itself, might have thinner walls so it's bending.
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  4. #4
    mtbr member
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    Here are some pictures. Kind of hard to see, but on the picture where you see the paint is worn off of the post, close inspection and feeling it shows that it has been flattened at these spots. On this post I thought maybe it was just a thin walled post, and it was cheap aluminum so I didn't worry about it too much. Recently upgraded to a dropper post though and it has started to happen on that post as well. I am concerned that the deformation might affect the functioning of the post.

    Seatpost damage question-img_20130912_073943-768x1024-.jpg
    Seatpost damage question-img_20130912_074007-1024x768-.jpg
    Seatpost damage question-img_20130912_074102-768x1024-.jpg
    Seatpost damage question-img_20130912_074136-1024x768-.jpg

  5. #5
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    Hi big D! Could you be over tightening it? Check the bore at the clamp and see if it might be smaller there than further in the seat tube. Any lip at all would spell trouble.
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  6. #6
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    HI Lew! I will take a closer look at the frame for any lip or anything but didn't notice any this morning. I did have it clamped on pretty tight, but that is because it was slipping before...

    Quote Originally Posted by BIGHORN LEW View Post
    Hi big D! Could you be over tightening it? Check the bore at the clamp and see if it might be smaller there than further in the seat tube. Any lip at all would spell trouble.

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