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Old 09-08-11, 02:38 PM   #1
chibi
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Dented chainstay, is it safe to ride?



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
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Old 09-08-11, 02:40 PM   #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.
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Old 09-08-11, 04:29 PM   #3
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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.
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Old 09-08-11, 04:40 PM   #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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Old 09-08-11, 07:11 PM   #5
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If a dent like that caused failure the CPSC would have outlawed aluminum frames years ago. Ride it fearlessly.
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Old 09-08-11, 07:29 PM   #6
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Chainstay wall thickness is likely to be relatively substantial, I'm tipping
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Old 09-08-11, 08:29 PM   #7
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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?
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Old 09-08-11, 08:37 PM   #8
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A close up of the nasty:

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Old 09-08-11, 09:00 PM   #9
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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
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Old 09-08-11, 09:04 PM   #10
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Quote:
Originally Posted by chibi View Post


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
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Old 09-08-11, 09:50 PM   #11
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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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Old 09-08-11, 09:55 PM   #12
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looks fine to me!
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Old 09-08-11, 10:00 PM   #13
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Thanks all for the replies. I will keep an eye out and keep on riding.
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Old 09-08-11, 11:31 PM   #14
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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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Old 09-08-11, 11:51 PM   #15
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I bang in bigger dents to clear the chainrings.
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Old 09-08-11, 11:56 PM   #16
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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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Old 09-09-11, 06:37 AM   #17
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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.
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Old 09-09-11, 07:03 AM   #18
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Quote:
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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.
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Old 09-09-11, 07:43 AM   #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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