CAAD 10 frame dented
#4
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Joined: Oct 2013
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From: D'uh... I am a Cutter
Bikes: '17 Access Old Turnpike Gravel bike, '14 Trek 1.1, '13 Cannondale CAAD 10, '98 CAD 2, R300
#5
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From: Ffld Cnty Connecticut
Bikes: Old Steelies I made, Old Cannondales
Ruined. Send it to me .... if it's a 56 cm
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Bikes: Old steel race bikes, old Cannondale race bikes, less old Cannondale race bike, crappy old mtn bike.
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#6
Senior Member
Joined: Oct 2014
Posts: 571
Likes: 1
It looks almost like you scraped the paint off judging from your picture. I don't really see a dent. I don't see any sort of depression.
I would just ride it and keep an eye on it, because that's near the welds and it might be in the heat affected zone. These zones are generally a bit weaker than the non heat affected zones.
Just be glad that you didn't hit the top tube. That part is supposedly very fragile - fragile enough to be dented by a knee while pedaling. Some people report they can feel the top tube flex when squeezing it.
I would just ride it and keep an eye on it, because that's near the welds and it might be in the heat affected zone. These zones are generally a bit weaker than the non heat affected zones.
Just be glad that you didn't hit the top tube. That part is supposedly very fragile - fragile enough to be dented by a knee while pedaling. Some people report they can feel the top tube flex when squeezing it.
#7
Senior Member


Joined: Jun 2008
Posts: 9,201
Likes: 289
From: Vancouver, BC
I wouldn't replace it unless someone else was paying for it. I don't think a dent in that location would weaken anything as I believe the force would be transmitting along the axis of the tube. I would be more concerned if there was a bending moment on that tube but I don't think there would be under normal or even hard riding.
I'd keep riding it and just keep an eye on it to see if it changes at all.
I'd keep riding it and just keep an eye on it to see if it changes at all.
#8
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Joined: Oct 2004
Posts: 3,248
Likes: 4
From: Seattle
Bikes: Kuota Ksano. Litespeed T5 gravel - brilliant!
It looks almost like you scraped the paint off judging from your picture. I don't really see a dent. I don't see any sort of depression.
I would just ride it and keep an eye on it, because that's near the welds and it might be in the heat affected zone. These zones are generally a bit weaker than the non heat affected zones.
Just be glad that you didn't hit the top tube. That part is supposedly very fragile - fragile enough to be dented by a knee while pedaling. Some people report they can feel the top tube flex when squeezing it.
I would just ride it and keep an eye on it, because that's near the welds and it might be in the heat affected zone. These zones are generally a bit weaker than the non heat affected zones.
Just be glad that you didn't hit the top tube. That part is supposedly very fragile - fragile enough to be dented by a knee while pedaling. Some people report they can feel the top tube flex when squeezing it.
OP, I didn't say why I think you're okay. It wasn't a flip comment. I just don't see how your dent can possibly impact durability in the short or long term. It may be in a heat treated region of the tube set but it a region that is buttressed by the juncture of four tubes and that tends to strengthen/support, not weaken, the overall structural properties of the metal in that area. Said another way, if you want to split a log, hit it where the grain is clean, not in a region blooming with knots. There's no way your frame is going to split through that tangle of knots.
#10
It's fine - for now.
I don't really see a dent in the pictures, just paint scratched off. But if there is indeed a dent, just keep an eye on it. Aluminum does not like to be dented, and eventually, the stress of riding will cause it to crack. It may happen tomorrow or it may happen in five years. It really depends on how big the dent is, where it is and how much you torque the frame. The last aluminum frame I dented lasted about six more weeks before it cracked.
Once it cracks, you will need to replace the frame. But until then, you are fine.
A really nice thing about aluminum is that it fails slowly. You will see the crack form first. It's not going to suddenly crack and break off.
I don't really see a dent in the pictures, just paint scratched off. But if there is indeed a dent, just keep an eye on it. Aluminum does not like to be dented, and eventually, the stress of riding will cause it to crack. It may happen tomorrow or it may happen in five years. It really depends on how big the dent is, where it is and how much you torque the frame. The last aluminum frame I dented lasted about six more weeks before it cracked.
Once it cracks, you will need to replace the frame. But until then, you are fine.
A really nice thing about aluminum is that it fails slowly. You will see the crack form first. It's not going to suddenly crack and break off.
#12
Thread Starter
Newbie
Joined: May 2015
Posts: 2
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Hi All,
I want to thank you guys for your help. I took the bike to the LBS and they recommended to keep riding until a crack form and then do a crash replacement frame. I think I will do that. Hopefully it will last me a whi
I want to thank you guys for your help. I took the bike to the LBS and they recommended to keep riding until a crack form and then do a crash replacement frame. I think I will do that. Hopefully it will last me a whi
#16
Senior Member
Joined: Oct 2014
Posts: 571
Likes: 1
Still, I wouldn't worry too much about that "dent" to the seat stay because I can't see it and even if one seat stay completely goes, you still have another seat stay, top tube, and downtube supporting the seat tube.
A handlebar - once that goes - not much is left!
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