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Dent in my top tube.

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Dent in my top tube.

Old 11-16-10, 09:07 AM
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neebone
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Dent in my top tube.

I have a Caad9 5 thats only about 2 1/2 months old and around 300 miles on it. I got it out to ride sunday and seen a nasty dent on the side of the top tube. I have no idea how it got there. I'm sure my crazy 4 year old daughter had something to do with it. Or perhaps my wife who has some jealousy towards it, may have taken it for a ghost ride. Neither one is going to fess up on the matter. Anyways, is this something that can be fixed. the paint is not cracked (Yet) around the dent. I dont think its anything more than cosmetic but it still concerns me. I'm sure this will bring out the caad haters, but oh well, do your worst. Anyone that would have some useful advice would be appriciated.
Thanks
B
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Old 11-16-10, 09:09 AM
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Pictures?
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Old 11-16-10, 09:13 AM
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It's usually not a good idea to repair a dent on a bike frame as stressing it one more time will only lead it closer to failure. Check for any jagged or sharp bends in the metal. That's what did my top tube in over the Summer (it started ripping the metal all the way around the tube). Smooth dents usually don't cause a problem, but I advise against covering it with anything because you'll want to look at it frequently to make sure it's not developing some sort of problem (mine took over a year to happen).

If you want to be on the safe side, since the frame is so new, just get it replaced under a crash policy.
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Old 11-16-10, 09:19 AM
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Originally Posted by danvuquoc View Post
Pictures?
I will post some on here first thing tomorrow morning or perhaps tonight.
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Old 11-16-10, 09:28 AM
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Really depends on the depth of the dent, and its location. If it not's too big, you can ride it and just keep an eye on it. However, if it's substantial, and in a place wher ethe tubing is very thin, it substantially weakens the tube (think a beer can with a dent in the side) and can be a problem.

My wife's CAAD 9 suffered a fatal dent when the bike fell over in the garage.

On the other hand, our aluminum tandem has a very small dent in the top tube (sliding down a post it was leaned against at a convenience store) that isn't big enough to worry about.
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Old 11-16-10, 09:34 AM
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Originally Posted by merlinextraligh View Post
Really depends on the depth of the dent, and its location. If it not's too big, you can ride it and just keep an eye on it. However, if it's substantial, and in a place wher ethe tubing is very thin, it substantially weakens the tube (think a beer can with a dent in the side) and can be a problem.

My wife's CAAD 9 suffered a fatal dent when the bike fell over in the garage.

On the other hand, our aluminum tandem has a very small dent in the top tube (sliding down a post it was leaned against at a convenience store) that isn't big enough to worry about.
Did cannondale replace your wife's caad9?
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Old 11-16-10, 09:38 AM
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Originally Posted by neebone View Post
Did cannondale replace your wife's caad9?
For $400, and it was less than a week old.
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Old 11-16-10, 09:41 AM
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Originally Posted by merlinextraligh View Post
For $400, and it was less than a week old.
The replacement discount seems reasonable to me as the dent was not a manufacturer defect. Granted, less or free would have been better, but more would have been far worse. Did it strike something in particular to put a fatal dent in the frame?
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Old 11-16-10, 10:10 AM
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If there are no sharp edges, leave it.

Sharp edges = stress raiser = tube will fail.

I have a no-sharp-edge dent in my top tube. I'm not going to do anything about it.

You can kind of see it here, in front of the white decal on my top tube:
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Old 11-16-10, 10:49 AM
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Originally Posted by carpediemracing View Post
If there are no sharp edges, leave it.

Sharp edges = stress raiser = tube will fail.

I have a no-sharp-edge dent in my top tube. I'm not going to do anything about it.

You can kind of see it here, in front of the white decal on my top tube:
That actually looks really close to what my dent looks like. Same distance from the seat tube but on the other side.
I just got off the phone with the tech at A & B Bicycle where I bought it, and he pretty much said what you did. He said it kind of matters on the amount of force and the way the dent happened that needs to worry you. I am just going to keep an eye on it and keep riding.

Thanks
B
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Old 11-16-10, 10:55 AM
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Originally Posted by ahumblecycler View Post
Did it strike something in particular to put a fatal dent in the frame?
Metal christmas tree stand. The christmas present didn't last long enough for the decorations to be all put away.

I was ok with treating as a crash replacement. It's the price of making the frame very light.
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Old 11-16-10, 11:32 AM
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I dented the top tube of an older S-Works aluminum bike I used to race on. After about six more crits, a crack started to form across the top of the dent. I hung the frame up and replaced it with a Caad 9 that I got cheaply.

The nice thing about aluminum is that it won't fail catastrophically, so you can ride it and see how the dent changes.
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Old 11-16-10, 12:05 PM
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Originally Posted by topflightpro View Post
The nice thing about aluminum is that it won't fail catastrophically
I wouldn't go that far, but it is unlikely.
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Old 11-16-10, 12:06 PM
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Originally Posted by neebone View Post
That actually looks really close to what my dent looks like. Same distance from the seat tube but on the other side.
I just got off the phone with the tech at A & B Bicycle where I bought it, and he pretty much said what you did. He said it kind of matters on the amount of force and the way the dent happened that needs to worry you. I am just going to keep an eye on it and keep riding.

Thanks
B
I just realized that I dented the frame when it was pretty new too, like 2? months old. Maybe 3. So, yeah, it was new to me too. Just no replacement policy.
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Old 11-16-10, 12:08 PM
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I did the same thing...hit it with my apartment door. Been riding it for a year now...I'm ok with it. Totally up to you what you decide on. If you're going to ride it, it's best not to think about it
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Old 11-16-10, 12:08 PM
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Has anyone tried paintless dent removal on an aluminum frame? This might work for some situations where there is no crease. Repairing the frame in this way may bring back some of the frames structural integrity as well as improve its visual aesthetics.
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Old 11-16-10, 12:13 PM
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Someone gave my brother and old CAAD with a dented top tube. He rode it for years, then I had a go with it. Then we left it out on the street to be recycled. Its probably still in use.
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Old 11-16-10, 12:18 PM
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Originally Posted by neebone View Post
I have a Caad9 5 thats only about 2 1/2 months old and around 300 miles on it. I got it out to ride sunday and seen a nasty dent on the side of the top tube. I have no idea how it got there. I'm sure my crazy 4 year old daughter had something to do with it. Or perhaps my wife who has some jealousy towards it, may have taken it for a ghost ride. Neither one is going to fess up on the matter. Anyways, is this something that can be fixed. the paint is not cracked (Yet) around the dent. I dont think its anything more than cosmetic but it still concerns me. I'm sure this will bring out the caad haters, but oh well, do your worst. Anyone that would have some useful advice would be appriciated.
Thanks
B
Um okay.... I think I would be keeping the frame but trading in the wife under a replacement plan.
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Old 11-16-10, 12:28 PM
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Originally Posted by slowandsteady View Post
Um okay.... I think I would be keeping the frame but trading in the wife under a replacement plan.

If only there was such a plan.
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Old 11-16-10, 12:31 PM
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Originally Posted by lpolliard View Post
Has anyone tried paintless dent removal on an aluminum frame? This might work for some situations where there is no crease. Repairing the frame in this way may bring back some of the frames structural integrity as well as improve its visual aesthetics.
My understanding is that every time the metal is bent, it weakens it. That includes removing a dent. So you can't restore any structural integrity. If it's going to fail, removing the dent will just bring it closer to that fatal time.

I believe that the only safe way to remove a dent in a bike tube is by closing off the tube and forcing air into it to push the dent back out, but even that doesn't help structural integrity, still risks total failure, and costs about as much as a replacement frame anyway.
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Old 11-16-10, 12:39 PM
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neebone, Don't worry about it unless the paint starts to follow a crack in the aluminum. Most likely it'll be fine to ride for decades.

Brad
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Old 11-16-10, 12:40 PM
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Originally Posted by neebone View Post
I have a Caad9 5 thats only about 2 1/2 months old and around 300 miles on it. I got it out to ride sunday and seen a nasty dent on the side of the top tube. I have no idea how it got there. I'm sure my crazy 4 year old daughter had something to do with it. Or perhaps my wife who has some jealousy towards it, may have taken it for a ghost ride. Neither one is going to fess up on the matter. Anyways, is this something that can be fixed. the paint is not cracked (Yet) around the dent. I dont think its anything more than cosmetic but it still concerns me. I'm sure this will bring out the caad haters, but oh well, do your worst. Anyone that would have some useful advice would be appriciated.
Thanks
B
Separate rooms, locked doors, light deprivation and water boarding should help get to the bottom of the mystery.
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Old 11-16-10, 12:42 PM
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I crashed on my 9 once previously. The frame had a dent @ the seatstays. Took it to a shop, and they played with the frame and looked at the dent while a tech jumped on the pedals etc. They weren't worried. Just told me to keep an eye on it for paint flakes etc. If the paint around the dent starts to crack, then it's time for a new frame.
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Old 11-16-10, 12:42 PM
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Originally Posted by urbanknight View Post
My understanding is that every time the metal is bent, it weakens it. That includes removing a dent. So you can't restore any structural integrity. If it's going to fail, removing the dent will just bring it closer to that fatal time.

I believe that the only safe way to remove a dent in a bike tube is by closing off the tube and forcing air into it to push the dent back out, but even that doesn't help structural integrity, still risks total failure, and costs about as much as a replacement frame anyway.

Not really. Cold working a metal actually makes is stronger. Take a paperclip and bend it back and forth. The deformed section actually gets stronger, not weaker, but the bend starts happening in a more and more localized area. As that area shrinks, the stresses go way up and it breaks.

If you were able to pop the dent back out, the structural integrity should be as good as new, if not better. What CDR said is also true, though, if there's a sharp edge or crease, then the localized area is 'defined' and it's basically turns into a dotted line. It will break there. If it's a smooth edged dent, though, you may be OK.
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Old 11-16-10, 01:19 PM
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Originally Posted by Nachoman View Post
Separate rooms, locked doors, light deprivation and water boarding should help get to the bottom of the mystery.
That sounds fair.
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