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  1. #1
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    Hairline "crack" in ~'87 High Sierra seatpost?

    So at the co-op where I volunteer, we have this absolutely beautiful, all original, black chrome High Sierra in very good condition overall. The anodizing (?) on the stem has faded evenly to an amazing copper color that I thought was intentional until I looked up the specs. Lovely bike. Rack bosses front and rear are just calling out for some kind of camping trip. It's hard to resist.

    Anyway, I was preparing the bike for sale, and I noticed a horizontal hairline crack in the seatpost about a 1/2 inch below where the clampy part ends and the posty part begins. This crack does not go all the way around, but stops in a about 1/4 inch wide on each side of the post.

    Of course I assumed that this post would need to be replaced.

    However, I was riding around town, and I spied an interesting older yellow MTB locked up. As I always snoop about such things, I had a closer look. Lo and behold, it was another High Sierra from a different year (probably the very next year).

    So here's the weird part. As I was ogling the frame joinery and components, I noticed: THE SAME CRACK IN THE SAME SPOT IN THIS SEATPOST, which appeared to be the same make. The coincidence made me wonder whether the one we have is really about to fail or ... just what.

    Has anyone seen or heard about what I am seeing? Could it just be an artifact of manufacturing? Or is this seatpost a known dog? Other thoughts? Thanks.

    Sorry that I don't have a photo, but maybe I can add one soon.

  2. #2
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    First off hello, this is my first post after lurking for years literally. I have a sierra, I'll check tomorrow.

  3. #3
    Senior Member clasher's Avatar
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    Personally I wouldn't ride a bike with a crack in the seatpost no matter how nice it was. When it fails there's only a few places for that sharp piece of metal to go and none of them are pretty to think about...

  4. #4
    Senior Member El Segundo's Avatar
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    I have an '88 Diamond Back and the seat post cracked on it. Replace ASAP to avoid what @clasher was talking about.
    1988 TREK 400T, 1985 TREK 470, 1988 DiamondBack Ascent EX

  5. #5
    NT... Big Difference...
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    As I recall- that's a 26.0 seatpost-

    My stem Also did the copper fade- I raised the stem and now I have this black line under the copper!
    *Recipient of the 2006 Time Magazine "Man Of The Year" Award*

    "Go that way, really fast, if something gets in your way- turn." Charles DeMar

  6. #6
    Senior Member
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    This the seat post or seat tube? I'm confused.

  7. #7
    Senior Member loky1179's Avatar
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    I'd use the same test as I use on food that has maybe been sitting in my refrigerator too long: when in doubt, throw it out!

  8. #8
    Senior Member bwilli88's Avatar
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    I had this 25.4 seat post break on me while riding, took a few times til it broke bad enough to not ride it. I had to break off the bottom part because I still had to ride home. I put the post between two trees and broke off the last bit as it had split about 2/3 of the way thru.
    OKRlXLD_S1Q5pBwoRYlqnDS8sIKCfQPuKrGQ3DKWKHE-432x768.jpg
    It is real hard to find a long 25.4 seat post here in Cambodia.
    Biking in Cambodia
    <><

  9. #9
    Senior Member shoota's Avatar
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    Oh and carbon is the devil huh...
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  10. #10
    Senior Member himespau's Avatar
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    Seatposts are cheap. Replace it.
    Punctuation is important. It's the difference between "I helped my uncle, Jack, off a horse" and "I helped my uncle Jack off a horse"


  11. #11
    Senior Member bwilli88's Avatar
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    Quote Originally Posted by himespau View Post
    Seatposts are cheap. Replace it.
    When I can get one from the states, they have all sorts of bigger diameters but not 25.4
    Biking in Cambodia
    <><

  12. #12
    Senior Member TugaDude's Avatar
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    did the bike's seat post look like this one?

    image.jpg

  13. #13
    Senior Member TugaDude's Avatar
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    Quote Originally Posted by shoota View Post
    Oh and carbon is the devil huh...
    What does that have to do with this conversation? The original issue here sounds like a manufacturing issue possibly. The seat post on a 1987 was a two piece where the shaft and head are bonded together. In the case of the 25.4 post that broke, it could have been from deep scratches from twisting, who knows?

    Every product is susceptible to failure, I know because I work for a manufacturer and have to visit problem projects frequently.

    If these failures make you feel better about carbon fiber, that's cool too.

  14. #14
    Senior Member leftthread's Avatar
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    Here's a photo of the seatpost that was on my '87 High Sierra when I got it.




  15. #15
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    There is really a very good discussion on failure of aluminum stems right now. Much of this would apply to seatposts.

    Cheating death..............stem

    r

  16. #16
    NT... Big Difference...
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    Quote Originally Posted by Roll-Monroe-Co View Post
    So at the co-op where I volunteer, we have this absolutely beautiful, all original, black chrome High Sierra in very good condition overall. The anodizing (?) on the stem has faded evenly to an amazing copper color that I thought was intentional until I looked up the specs.

    My stem was black until I lent my High Sierra to my sister in law- apparently she stored the bike on their uncovered back porch- over winter.

    As effed up as it was- that stem looked cool. There's that black line RIGHT where it entered the headset.

    I raised the stem up a bit to the min insertion line and that black line showed.








    Right now the bike is set up with a drop bar.


    *Recipient of the 2006 Time Magazine "Man Of The Year" Award*

    "Go that way, really fast, if something gets in your way- turn." Charles DeMar

  17. #17
    Freewheel Medic pastorbobnlnh's Avatar
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    I'd replace it. I'm bringing this '92 Miyata Valley Runner home from FL and the saddle was spinning in the post.



    When I took it apart to pack I discovered the hairline vertical crack just below the seat rail clamp. The post is 26.8 Laprade. I'll keep it for clamping in the work stand.

    Bob
    Dreaming of Summertime in NH!

    Visit my websites:
    FreeWheelSpa.com orpastorbobnlnh.com

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