Does Carbon Fiber Have A Lifespan?- Mtbr.com
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  1. #1
    Retro Grouch
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    Does Carbon Fiber Have A Lifespan?

    Or better stated, does carbon fiber fatigue or weaken over time? I only have two carbon fiber components. One is a fork on a road bike that I'm not concerned about, but the other is a Titec/ Bontrager seatpost that I am told was OEM on the Racelite I own. If that's true, it's nearly 15 years old. The post shows very little sign of wear and is the tube walls are quite a bit thicker than current carbon fiber seatposts. What say you?
    Just one more rep and I get the toaster!

  2. #2
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    If I knew when people were going to die I'd charge you 5G for that info.

  3. #3
    Ovaries on the Outside
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    Carbon fiber fatigue life is supposed to be fantastic. I'd say you're golden: http://www.calfeedesign.com/whitepaper4.htm

  4. #4
    Out spokin'
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    Quote Originally Posted by the pope
    If I knew when people were going to die I'd charge you 5G for that info.
    With a handle like "the pope," I'd think you'd be rich.

    Just sayin'.

    --Sparty
    disciplesofdirt.org

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    We get old because we quit riding.

  5. #5
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    I'd be rich until the word-of-mouth. Every story would be like The Monkey's Paw but, sorry, no refunds.

  6. #6
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    Scientifically carbon fiber does not fatigue. In practical applications it does show signs of fatigue.

  7. #7
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    CF's life ends when hit with sudden impact. Other than that, you're ok. Just make sure there are no cracks and clear coat is in tact. I had an old Klein road bike (11 yrs old) with a carbon fork and it's still going strong today.

  8. #8
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    yes and no. if you crash and it is hit really hard, like when a smug wannabe bike messenger in portland can't stop on his fixieand hits a bus. no impacts you are golden.
    Ride & Smile

  9. #9
    Off the back...
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    Quote Originally Posted by the pope
    If I knew when people were going to die I'd charge you 5G for that info.
    You need to invent some sort of Death Clock.
    @pinkrobeyyc
    #pinkrobeyyc

  10. #10
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    Yes, props lend a poignant aura. Some type of Liberace style cape and candelabra would be nice.

    Thusly:


  11. #11
    Out spokin'
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    You have found your new avatar.

    --Sparty
    disciplesofdirt.org

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    We get old because we quit riding.

  12. #12
    All 26.5" all the time!
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    CFRP (Carbon Fiber Reinforced Plastic) doesn't really fatigue like metals -- work hardening and cracking-- but the layers can delaminate and fail over time with repeated stresses.

    It's a complex subject as CFRP can constructed in many different ways, but some common field tests are visual (use a flashlight to inspect the inside wall of the tube for defects) or the tap test: http://www.bike-manual.com/brands/bo...bon_fiber.html

  13. #13
    Meat Clever
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    Quote Originally Posted by the pope
    Yes, props lend a poignant aura. Some type of Liberace style cape and candelabra would be nice.

    Thusly:

    Who knew?
    Quote Originally Posted by VanillaEps View Post
    A little bit of pee just trickled out of my pipi when I saw that.

  14. #14
    Big Gulps, Alright!
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    Quote Originally Posted by the pope
    Yes, props lend a poignant aura. Some type of Liberace style cape and candelabra would be nice.

    Thusly:

    What a ladies man
    Axle Standards Explained

    Founder at North Atlantic Dirt, riding & writing about trails in the northeast.

  15. #15
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    I thought it was an ad for light bulb candles.

  16. #16
    PMK
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    Quote Originally Posted by Berkley
    What a ladies man
    I suspect you are being sarcastic...

    PK

  17. #17
    Big Gulps, Alright!
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    Quote Originally Posted by PMK
    I suspect you are being sarcastic...

    PK

    More than a little bit.
    Axle Standards Explained

    Founder at North Atlantic Dirt, riding & writing about trails in the northeast.

  18. #18
    PSYCHOLUST
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    Isn;t it odd that LIBERACE was a limp wristed, lisping, CAPE wearing CELEB on all kinds of mainstream TV shows for 35 years and people were SHOCKED to hear that he was GAY after his death
    ( I mean they HEARD about it after his death, not that he was GAY after his death )

    ( and NO, I am not homophobic, I'm pianophobic)

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