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  1. #1
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    Carbon Fiber crack

    With my Rocky Mountain Element, I have one swing arm piece that's carbon fiber and I've managed to crack it twice now this year.

    It's not busted though...didn't shatter or crack immediately and mechanic told me to put sme clear nail polish on it. Its not a huge indent and the part still feels strong...would you ride it? Anyone had experience with this sort of thing? Part's already on its way.

  2. #2
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    Carbon failure is pretty sudden and total. If your part fails, will it cause you to eat dirt or will it be something you can ride out? If later, I'd still ride. Else, put that bike up and go hiking or something.
    If it's just the clear coat, I like to use epoxy thinned by rubbing alcohol, then use stretch wrap to seal during cure. This will leave you w/ a shiny finish if you work out all the air bubbles...a hair dryer helps here before you seal wrap it.
    Naysayers never apologize. Critics go to their grave thinking everyone else is wrong.
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  3. #3
    bacon! bacon! bacon!
    Reputation: SkaredShtles's Avatar
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    Carbon fiber? That $hit will KILL YOU!


  4. #4
    holding back the darkness
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    pictures.
    **** censorship

  5. #5
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    an excrement made with corn flake

    sounds abysmal

  6. #6
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    If it is cracked, it is going to fail, probably at the worst possible time. I would wait for the new part before you have a bigger problem.
    Like Pau11y said- go hiking or something else.

  7. #7
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    nail polish? Bru haa haa. Such a female amateur move. USE DUCT TAPE!
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  8. #8
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    Quote Originally Posted by IndecentExposure View Post
    nail polish? Bru haa haa. Such a female amateur move. USE DUCT TAPE!
    meh

    you forgot zip ties

  9. #9
    Product engineer
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    cracks only get bigger.... until you have two separate pieces
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  10. #10
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    Duct tape was the first thing I thought of too BUT...then you can't see if the crack is getting worse...it held up this weekend, I rode anyway.

  11. #11
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    Quote Originally Posted by element1 View Post
    Duct tape was the first thing I thought of too BUT...then you can't see if the crack is getting worse...it held up this weekend, I rode anyway.
    Post some pics.
    Naysayers never apologize. Critics go to their grave thinking everyone else is wrong.
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  12. #12
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    picture

    Here it is but its a cell phone pic and the white scraping was so bad you can't really see the actual crack in the carbon. Which is why I didn't post anything before...you can't really see it in a picture.
    Attached Images Attached Images  

  13. #13
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    http://sollercomposites.com/

    They sell sleeve CF/Kevlar and shrink-wrap tubing to get a nice glossy finish. Good prep work is key to a good bond.

  14. #14
    holding back the darkness
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    You sure that's a crack in the carbon? Maybe just the clear? Maybe just the outer 90 degree weave...
    Also kinda depends on the processes and layup used as to how bad any damage might be.
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  15. #15
    Got single track/speed?
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    If you see a real crack or a deep gouge that goes into the second layer of carbon, it isn't worth it. I had a friend who had a Rocky Mountain and cracked the same part. It came apart while he was riding slow. IMHO, chain/seat stays on a MTB is no place for carbon fiber.

    -Chuck

  16. #16
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    You could deep fry it, it might just weld everything back together. Burger king is your answer.

    I'm here to solve your problems.
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  17. #17
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    Quote Originally Posted by chuckjoga View Post
    If you see a real crack or a deep gouge that goes into the second layer of carbon, it isn't worth it. I had a friend who had a Rocky Mountain and cracked the same part. It came apart while he was riding slow. IMHO, chain/seat stays on a MTB is no place for carbon fiber.

    -Chuck
    I completely agree...this is the second one this year.

  18. #18
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    Quote Originally Posted by IndecentExposure View Post
    You could deep fry it, it might just weld everything back together. Burger king is your answer.

    I'm here to solve your problems.
    Agreed...maybe Jack in the Box would be even better...they got the frying down to a fine art.

  19. #19
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    Quote Originally Posted by element1 View Post
    Agreed...maybe Jack in the Box would be even better...they got the frying down to a fine art.
    See, now that is teamwork. Multiple options and solutions to problems.

    Have you thought of this new metal they call aluminumium? I hear its quite tasty.
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  20. #20
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    This fine yound lady here has more problems than just her bike....

    Oh...and just ride it in the meantime. It's not like your cuts and bruises can get any worse, eh?

  21. #21
    Rigid in Evergreen
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    If it doesn't jeopardize your warranty claim, then I'd ride it... I just wouldn't ride it TOO hard or TOO far... just in case it does fail catastrophically

  22. #22
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    Quote Originally Posted by IndecentExposure View Post
    You could deep fry it, it might just weld everything back together. Burger king is your answer.

    I'm here to solve your problems.
    Wait a minute, wait a minute. I thought BK didn't fry their burgers? Oh the fries........yeah that'll work.

    In all seriousness, I'd be scared to ride a cracked carbon anything.

  23. #23
    contains quinine
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    First time I've heard of repairing carbon:

    http://303cycling.com/New-Business-B...-Broken-Carbon

    fwiw, Han Solo never seemed the same after being frozen in carbon. Might be time to move on.
    Take the long cut, we'll get there eventually.

  24. #24
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    Quote Originally Posted by Debaser View Post
    First time I've heard of repairing carbon:

    http://303cycling.com/New-Business-B...-Broken-Carbon

    fwiw, Han Solo never seemed the same after being frozen in carbon. Might be time to move on.
    How dare you impune Han Solo's name! He just needed some time so shake off the hibernation sickness.

    BTW, all those "repairs" look like tape.

  25. #25
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    Quote Originally Posted by jjonas View Post
    http://sollercomposites.com/

    They sell sleeve CF/Kevlar and shrink-wrap tubing to get a nice glossy finish. Good prep work is key to a good bond.

    Best thing I have gotten out of mtbr forums for awhile.

    Element1 take a descent picture.
    Here is some more fun stuff.

    http://www.youtube.com/watch?v=ETQ1FIwhNsQ
    http://www.youtube.com/user/carbonmods
    http://www.youtube.com/watch?v=IAdVO8Rkv6c
    http://www.youtube.com/watch?v=0UFRwmodFrU
    Love the before and after pics.
    http://brokencarbon.com/?page_id=48
    Last edited by glovemtb; 07-13-2011 at 03:45 AM.

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