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PostPosted: Thu Sep 14, 2017 10:03 pm 
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Joined: Tue Nov 12, 2013 9:12 pm
Posts: 33
Hmm I have a similar dent on my CAAD12 top tube that I've been riding all season. This post is making me slightly worried now. I'll try and get pics up for assessment.

I will say that as much as I like my 12, my next frame will NOT be super light alu. Way too susceptible to accidental dents.


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PostPosted: Fri Sep 15, 2017 12:30 am 
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Joined: Tue Nov 12, 2013 9:12 pm
Posts: 33
These aren't the best pictures but they were the best my phone could capture. Ignore the paint protection film and some dirt which is to protect the top tube when transporting on my car rack.

Image

Image

Image

Does anyone have any opinions? Rideable but just keep an eye on it?


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Posted: Fri Sep 15, 2017 12:30 am 


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PostPosted: Fri Sep 15, 2017 1:24 am 
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Joined: Tue Mar 18, 2014 10:13 pm
Posts: 473
Location: Great Southern Land
Yes that would concern me. I would be looking to replace the frame.......... but then my OCD wouldn't put up with seeing the dent whenever I looked down

BB

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PostPosted: Fri Sep 15, 2017 2:39 am 
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Joined: Thu Mar 09, 2017 5:35 am
Posts: 131
I dented a top tube in an old XC mountain bike worse than that, rode it for thousands more kms and sold it to a friend, he rode it for thousands more. Heavens knows where the bike is now, maybe retired, it's done it's 7 years (lifetime of abuse). I really don't think crease-less top tube dents are anything to worry about.


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PostPosted: Fri Sep 15, 2017 2:43 am 
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Joined: Sat Oct 15, 2016 9:08 pm
Posts: 221
I would like to hear Cannondale's response. Is this normal? Can it be ridden further? Can it be fixed?


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PostPosted: Fri Sep 15, 2017 3:08 am 
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Location: On the bike
Lewn777 wrote:
I dented a top tube in an old XC mountain bike worse than that, rode it for thousands more kms and sold it to a friend, he rode it for thousands more. Heavens knows where the bike is now, maybe retired, it's done it's 7 years (lifetime of abuse). I really don't think crease-less top tube dents are anything to worry about.


Old XC MTB =/= lightweight aluminum CAAD12 frame where Cannondale has gone to the extremes to cut weight. You are comparing apples to potatoes.

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PostPosted: Fri Sep 15, 2017 3:27 am 
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Joined: Tue Jun 30, 2015 3:30 am
Posts: 280
dton13 wrote:
Hmm I have a similar dent on my CAAD12 top tube that I've been riding all season. This post is making me slightly worried now. I'll try and get pics up for assessment.

I will say that as much as I like my 12, my next frame will NOT be super light alu. Way too susceptible to accidental dents.

mind telling us how u did that? handlebar strike?


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PostPosted: Fri Sep 15, 2017 4:56 am 
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Joined: Tue Jul 26, 2016 5:21 pm
Posts: 141
topflightpro wrote:
You're fine to ride that as long as it isn't cracked.

Aluminum doesn't like to be dented, and it really can't be hammered or sucked back out, so the dent is going to stay there. As someone else noted, there doesn't appear to be a crease, which is a good thing.

The frame was likely weakened by the dent, but not so significantly you need to worry. Really, aluminum will form a crack and tear, but it's not catastrophic. So, go ahead and ride the heck out of it until you see it crack.

Lastly, yes, the aluminum is very thin, and has been getting thinner as they strive for lighter frames. Still, it was possible to dent and break heavier aluminum frames. I lost an 03 S-Works E-5 to a dent. I went down in a crash, and my bar slammed into the top tube. The frame survived about six more weeks of racing before it cracked. I'd still put it on a trainer though if I needed to.

You don't know things about almuminium and fatigue.


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PostPosted: Fri Sep 15, 2017 10:12 am 
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Posts: 193
Interesting dton13, thanks for posting. Interested to know how you did it and what others think re. frames strength / chance of failure.

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> '17 CAAD12 Disc 8.16kg

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PostPosted: Fri Sep 15, 2017 4:39 pm 
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Joined: Tue Mar 13, 2012 7:27 pm
Posts: 143
The red one scares me more than the OP bike. But still...
It's not just that the walls are thin on top tubes in these locations... its that the alloy and how the tubes are made make the metal harder but more brittle, and a failure could happen quickly, almost explosively.
I got a great deal on an CAAD10 frame that had a much smaller dent in the downtime near top, and wasn't worried about it, but when I got the frame home looked more closely with an oblique light source just out of an abundance of caution and ... there was a tiny crack in the aluminum.
That crack was on the outside, and is the kind of stress riser where failure starts.... these, especially the red one, may have such cracks on the inside... dunno.
I'd happily ride both as dedicated trainer bikes but ... prob not on the road.


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PostPosted: Fri Sep 15, 2017 4:58 pm 
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Joined: Tue Nov 12, 2013 9:12 pm
Posts: 33
Mine was pure carelessness, bike tipped over into an open door frame. Stupid, but I can't help but feel that carbon wouldn't have sustained that kind of damage (maybe super light carbon?) based on what my previous bike was able to withstand. My top tube also has a smaller dent on the bottom side from a handlebar strike.

I appreciate all the input! I'm going to start the search for a new frame but keep riding the bike for now since its my only bike and I'm pretty light at 63 kg.


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