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  1. #1
    int'l house of paincakes
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    rock through aluminum frame

    had a rock rolling around inside my frame. took the bike apart to find out how it got there and found this hole hidden by the small chainring. anyone seen a rock go through an aluminum tube before? i assume it bounced off the chainring and broke through on it's own. too big of a gap between the chainring and the frame to force it through.
    Attached Thumbnails Attached Thumbnails rock through aluminum frame-p2230022.jpg  

    rock through aluminum frame-p2230026.jpg  


  2. #2
    mtbr member
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    Hah I had something very similar happen.

    A rock jammed between my little chain ring and BB....

    As a pedalled it made a screeching sound for maybe two revolutions...

    Then I back pedalled and the rock came out....

    I would suggest you picked up a rock but larger the corner of it broke off as it hit the tube..a little chunk went inside....

    The rest of it rubbed as it went around a couple or so times causing the damage on the BB weld.

    Too Bad that is no the ideal place to have a hole in your frame.

  3. #3
    T.W.O.
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    Wow that's some rock!!

  4. #4
    Huckin' trails
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    That's some nasty business going on... You should post it in "rider down and rock in" forum

    But seriously, that's weird. Are you planning on getting it welded or what ?
    Quote Originally Posted by NicoleB28 View Post
    topless. that's what all mtb girls do. we go ride, get topless, have pillow fights in the woods, scissor, then ride home!

  5. #5
    Former Bike Wrench
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    I've dented aluminum from rocks but never put a hole in one. Remove the paint around it, if there are no cracks radiating from it then smooth out the hole to eliminate stress risers and you should be OK for right now. Keep a close eye on it.

    If it's a 7000 series frame you might be able to have a gusset welded on but a 6000 series frame requires heat treating after welding.

  6. #6
    Sweep the leg!
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    Bounced? not likely. It's more likely that the rock was sandwiched between the chainring and the frame. I'd have a reliable welder tap it close with a weld.
    Authorities speculate that speed may have been a factor. They are also holding gravity and inertia for questioning.

  7. #7
    since 4/10/2009
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    Quote Originally Posted by jeffscott View Post
    I would suggest you picked up a rock but larger the corner of it broke off as it hit the tube..a little chunk went inside....

    The rest of it rubbed as it went around a couple or so times causing the damage on the BB weld.

    Too Bad that is no the ideal place to have a hole in your frame.
    +1

    I bet the weld damage is associated with this rock in your frame. and it looks like a larger rock broke a piece off to fit through that hole.

  8. #8
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    crazy

  9. #9
    int'l house of paincakes
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    I actually raced 7 laps at 12 Hours Papago on it, 50+ miles . Squeeled like a pig the whole time. I thought it was a pivot point creaking until I started stripping it apart.

    Trek is providing a new frame under their crash replacement plan for a sreaming good price. Otherwise I was going to look at getting it repaired by an aluminum specialist.

  10. #10
    Huckin' trails
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    Glad to know you're covered for that frame. How much was the crash replacement plan for ?
    Quote Originally Posted by NicoleB28 View Post
    topless. that's what all mtb girls do. we go ride, get topless, have pillow fights in the woods, scissor, then ride home!

  11. #11
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    broken aluminum frame can't be fixed but carbon can right?

  12. #12
    LightJunction.com
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    Yikes.

    As for the repair, I broke an aluminum frame once and had it rewelded. Didn't hold up very long. I think the aluminum frame building process involves heat treating or something.
    We sell quality bike headlights and flashlights.
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  13. #13
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    Make sure you have a good welder do this...if not you'll end up with something like what you see in post #12 of this thread Broken chromoly frame; how to find a welder to repair?

  14. #14
    poser Administrator
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    Quote Originally Posted by sasquatch rides a SS View Post
    Make sure you have a good welder do this...if not you'll end up with something like what you see in post #12 of this thread Broken chromoly frame; how to find a welder to repair?
    my eyes cannot unsee that thread thank you very much.
    Try this: HTFU

  15. #15
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    It had to happen...I'm sorry

  16. #16
    int'l house of paincakes
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    cost for crash replacement frame reassembled by local shop (best in town) will be about $350 + tax. much better than $1700 retail price for a new frame.

  17. #17
    Huckin' trails
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    That's not too bad. Better than a new MSRP frame like you said.






    Quote Originally Posted by rockcrusher View Post
    my eyes cannot unsee that thread thank you very much.
    Here's some eye bleach for ya
    Quote Originally Posted by NicoleB28 View Post
    topless. that's what all mtb girls do. we go ride, get topless, have pillow fights in the woods, scissor, then ride home!

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