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  1. #1
    Nerdy Jock
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    New question here. How high can I mount seatpost?

    I have a "Carbon Tioga" seatpost that is a bit old ~ 2005ish, and the line that indicates max height (so shortest amount of the post being in the frame/below the clamp) has been worn off.

    The only thing that seems to be indicating max height is a little half-sphere that was machined out of the carbon. It is a few inches above the bottom.

    The seatpost isn't pure carbon btw, it is aluminum wrapped in carbon.

    I can get pictures if my explanation doesn't suffice.

    Thanks for any help!
    Current bike: Rocky Mountain ETS-X 70

  2. #2
    ups and downs
    Reputation: rockyuphill's Avatar
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    On an ETSX the bottom of the seatpost has to extend below the underside of the top tube at the seat tube junction, that should be about 4", so that would be the minimum insertion for frame survivability.
    I'm a member of NSMBA and IMBA Canada

  3. #3
    mtbr member
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    Usually as long as the seatpost goes below the top tube you'll be fine.


    Just make sure it goes below the red line and you should be fine.

  4. #4
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    Yap I agree with the above posts. It has to go in enough to clear the top tube welds. I have seen a couple of broken frames becuase the seat post wasn't inserted enough.

  5. #5
    Nerdy Jock
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    Interesting...so basically I need not worry about the seat post so much as the frame? Ok. Thanks!

    Sent from my fingers.
    Current bike: Rocky Mountain ETS-X 70

  6. #6
    No. Just No. Moderator
    Reputation: Circlip's Avatar
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    Quote Originally Posted by zaner123 View Post
    Interesting...so basically I need not worry about the seat post so much as the frame? Ok. Thanks!

    Sent from my fingers.
    You have to worry about both, but if the insertion is enough to go below the welds described by other posters to protect the frame, then it will also be enough to protect the seat post (on just about any typical frame).

  7. #7
    Nerdy Jock
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    Holy crap I'm glad I asked. Where I had the seat post, the bottom was a couple centimeters above the top of the top tube. I had maybe four hours of riding time like that... so it should be fine.

    Time to find another seat post. Any recommendations?

    Sent from my fingers.
    Current bike: Rocky Mountain ETS-X 70

  8. #8
    mtbr member
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    sounds like you might need a longer one. Measure your current one and see how far down you still need to go and order one for that length. Thompsons are a popular choice for seat posts, I have had good luck with eastons as well.

  9. #9
    Nerdy Jock
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    Yeah I definitely need a longer one.

    What should I look for except (low) weight?

    Sent from my fingers.
    Current bike: Rocky Mountain ETS-X 70

  10. #10
    is turning a big gear
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    Quote Originally Posted by zaner123 View Post

    Time to find another seat post. Any recommendations?
    Thomson.

    Probably the last seatpost you'll buy for 10 years (unless it doesn't fit your next bike).

  11. #11
    mtbr member
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    I too was wondering what the answer to this question was....thanks for the info

  12. #12
    Now broadcasting from CO
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    Quote Originally Posted by estabro View Post
    Thomson.
    Yes. It is the only seatpost.
    Brought to you by rocks.

  13. #13
    ups and downs
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    What year of ETS-X 70 do you have? 2004 and earlier are 26.8mm seatposts and I believe the 2005's and newer went to a 27.2mm post.

    Does your current post have any setback? If you're in need of a setback post, the Race Face Next SL posts are reliable, available in 400mm length and not too bad for weight. The Race Face Deus posts are slightly heavier but they both have a nice saddle clamp for round saddle rails.
    I'm a member of NSMBA and IMBA Canada

  14. #14
    Nerdy Jock
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    I think it is a 2005... Serial number is 200500

    Sent from my fingers.
    Current bike: Rocky Mountain ETS-X 70

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