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  1. #1
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    Dented chainstay, is it safe to ride?

    chainstay.jpg

    My aluminum CAAD 9's drive side chain stay was dented. Do you think it is still
    safe to ride? I took it out today but did not notice any change in handling.

    thanks

  2. #2
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    Unless that dent is a lot bigger and deeper than it appears in the photo, it's a non issue.

  3. #3
    Senior Member Chombi's Avatar
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    That looks pretty minor a dent? I think that as long as you do not see a crack with that dent, You should be generally OK to continue riding the bike, at your own risk, of course. Just watch it to make sure that any buckling of the stay might be developing with it. If you see any changes in the future, cease riding the bike immediately and seek the further advise of a frame builder familiar with aluminum frames.

  4. #4
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    It may eventually crack, but another area is just as likely to crack first so I wouldn't sweat it. Just keep an eye on it in case a crack begins to form.

    In any case, a chainstay failure is very unlikely to cause an accident, so it's not like you had a damaged fork. If you knew the number of chainstays out there still going despite being halfway sawn through by the chain, you probably wouldn't have asked.
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  5. #5
    another retro grouch Mr IGH's Avatar
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    If a dent like that caused failure the CPSC would have outlawed aluminum frames years ago. Ride it fearlessly.

  6. #6
    bike whisperer Kimmo's Avatar
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    Chainstay wall thickness is likely to be relatively substantial, I'm tipping

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    Okay. How about this one?



    That's a Mercian 531 steel chain stay.

    The axle lines up okay. It's visible to the side, but I can't see how the dropouts are out of alignment by naked eye.



    Would you ride it?
    Last edited by LeicaLad; 09-08-11 at 08:30 PM. Reason: 2nd photo
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    A close up of the nasty:

    1959 Hilton Wrigley Connoisseur (still my favorite!)
    1963 Hetchins Mountain King (the gravel grinder)
    1971 Gitane Tour de France (The War Horse)
    1971 Gitane Super Corsa (The Garage Queen)
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  9. #9
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    Quote Originally Posted by LeicaLad View Post
    A close up of the nasty:

    I'd have a look at the two paint wrinkles in front, but I'd ride it. As always, your bike, your choice.

    Brad

  10. #10
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    Quote Originally Posted by chibi View Post
    chainstay.jpg

    My aluminum CAAD 9's drive side chain stay was dented. Do you think it is still
    safe to ride? I took it out today but did not notice any change in handling.

    thanks
    chibi, I have worse on one of my Cannondales (for the last 15 years or so), just keep an eye on it.

    Brad

  11. #11
    Senior Member Homebrew01's Avatar
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    Quote Originally Posted by LeicaLad View Post
    Okay. How about this one?



    That's a Mercian 531 steel chain stay.

    The axle lines up okay. It's visible to the side, but I can't see how the dropouts are out of alignment by naked eye.



    Would you ride it?
    Yup
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  12. #12
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    looks fine to me!

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    Thanks all for the replies. I will keep an eye out and keep on riding.

  14. #14
    Constant tinkerer FastJake's Avatar
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    Quote Originally Posted by LeicaLad View Post
    Would you ride it?
    I'd be fine with the frame damage, but what's the largest cog on that freewheel?? 21T? I might have trouble with that
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  15. #15
    coprolite fietsbob's Avatar
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    I bang in bigger dents to clear the chainrings.

  16. #16
    Senior Member BCRider's Avatar
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    LeicaLad, in your case and since it's steel you may want to at least straighten out the kink so the stays on each side are the same length again. But as for the dent it's pretty much a non issue. If it were the seat stay which is under compression I'd be more worried. But the chainstay is under tension all the time so there is no risk of the dent allowing the tube to collapse.
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  17. #17
    bike whisperer Kimmo's Avatar
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    Quote Originally Posted by BCRider View Post
    But the chainstay is under tension all the time
    I wouldn't say that... The rider's weight puts it under a small amount of tension, but as soon as much power is applied, it's under compression.

  18. #18
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    Quote Originally Posted by Kimmo View Post
    I wouldn't say that... The rider's weight puts it under a small amount of tension, but as soon as much power is applied, it's under compression.
    It's also under a bending load since the top run of the chain is always above it. Even so, the damage seems minor and I don't expect either bike will fail in the forseeable future.

  19. #19
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    Thank you, gentlemen.

    I didn't mean to hijack the thread, but merely add to it. I also agree that the OP's dent is truly minor and a cosmetic issue. I hoped my issue merely added to the thread.

    The axle does line up, and it seems okay. This one IS quite visible tho'.

    Thanks for the advice. Much appreciated.
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