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Cosmetic or compromised?

Old 03-17-21, 03:45 PM
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Cassopher
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Cosmetic or compromised?


Crashed carbon bike and it has one deep chip in the paint. Is this cosmetic or has the structural integrity been compromised?
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Old 03-17-21, 04:05 PM
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More context. What bike is this? What part of the frame is this? All I can see is an unknown section of some part of a frame with a nick in it. Poorly lit at that
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Old 03-17-21, 04:06 PM
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Originally Posted by alcjphil View Post
More context. What bike is this? What part of the frame is this? All I can see is an unknown section of some part of a frame with a nick in it. Poorly lit at that

Top tube of an SL 7
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Old 03-17-21, 04:34 PM
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Originally Posted by Cassopher View Post
Top tube of an SL 7
And just what is an SL 7?
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Old 03-17-21, 04:36 PM
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Originally Posted by alcjphil View Post
And just what is an SL 7?

Tarmac
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Old 03-17-21, 05:28 PM
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I suggest you post some clearer pictures, some with a bit of distance, Members need a good look at the problem if you want reasonable opinions.
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Old 03-17-21, 06:02 PM
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Originally Posted by delbiker1 View Post
I suggest you post some clearer pictures, some with a bit of distance, Members need a good look at the problem if you want reasonable opinions.

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Old 03-17-21, 06:04 PM
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Originally Posted by Cassopher View Post

Crashed carbon bike and it has one deep chip in the paint. Is this cosmetic or has the structural integrity been compromised?





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Old 03-17-21, 06:05 PM
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Go ahead and do a tap test with a quarter. If tone changes to a lower tone from the surrounding area then there is a problem. That nick looks exactly like the one on a Trek frame I have in the basement. That frame has been compromised on the top tube and is no longer safe to ride.
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Old 03-17-21, 06:26 PM
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Nice duvet cover. I’d say take that to an LBS that is familiar with carbon frames for an in person diagnosis. It looks to me like the carbon itself is compromised. But to what extent? It may (or may not) have been damaged enough to pose a problem.
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Old 03-17-21, 06:55 PM
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I'd put some nail polish on it & not worry.

I had this unfortunate top tube event, & rode for 4 months & many hundreds of miles with a piece of tape on it before a DIY repair.


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Old 03-17-21, 07:12 PM
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These are bicycles made for normal regular use for decades with the corresponding nicks and dings. Ride and enjoy.
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Old 03-17-21, 07:59 PM
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So, people are trying to help you, and ask for clearer pics...and you post pics in which the bed in the background is in sharp focus and the bike is blurry.

You're making this difficult.
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Old 03-18-21, 06:51 AM
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That looks like it took a sharp impact as opposed to a scrape. If so, it's not promising.
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Old 03-18-21, 07:52 AM
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What will you do if you are told it's not safe to ride? Will you ride it anyway and perhaps just be watchful and careful of the dings?
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Old 03-18-21, 08:06 AM
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Although the OP seems to be treating this like a brain-teaser by providing as little helpful info as possible, I am curious as to how this damage to the toptube happened in crash. In most crashes, the handlebar, pedals, and saddle prevent the TT from contacting anything. So, was another cyclist involved?
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Old 03-18-21, 08:10 AM
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Originally Posted by Koyote View Post
Although the OP seems to be treating this like a brain-teaser by providing as little helpful info as possible, I am curious as to how this damage to the toptube happened in crash. In most crashes, the handlebar, pedals, and saddle prevent the TT from contacting anything. So, was another cyclist involved?
It wasn’t a rider involved crash. Our toddler knocked it over and it crashed into a piece of furniture.
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Old 03-18-21, 08:29 AM
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Buy new bike, send kid to boarding school.

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Old 03-18-21, 09:49 AM
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I would ride that without hesitation. Worst case scenario, you'll see more cracks developing, etc. It's not just suddenly going to come apart from its current state while you're riding. People here are just way too cautious.
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Old 03-18-21, 09:52 AM
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Do the tap test. Do NOT pay any attention to posters saying it's fine after looking at crappy blurry photos. Carbon road bikes are designed to be ridden, not crashed into furniture w/ sharp edges. Carbon mountain bikes are a different story. And OP...please work on your photo skills, I find it amazing that someone can ask for help with a problem and then post crappy photos like this. Come on, at least make an effort.
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Old 03-18-21, 10:50 AM
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It's honestly very hard to give advice when the photos aren't clear at all. We can't accurately say whether or not this is fine to continue riding. I personally would ride it, but that's just me.
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Old 03-18-21, 10:58 AM
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Take it to a shop and ask them.
No one on the internet is going to be able to give you any kind of reasonable answer based on these photos.
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Old 03-23-21, 06:20 PM
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cosmetically compromised.
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Old 03-25-21, 11:24 AM
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Lol typical cyclists, complaining about details and pictures. Yeah, some of those things matter but one look at even these crappy photos the extent of damage is pretty clear cut.

Not what you want to hear but this is one of the big issues I have with carbon. I hate playing the carbon is it a chipped or cracked game.

So no one on the internet can tell you if the bike is compromised and it's highly unlikely you or a LBS will know 100% either way. In theory yeah carbon could be cracked and the paint is acting like a skin where it makes it impossible to visually look for cracks unless you completely sanded it down. You could have it ultrasonically tested or even xrayed but finding and paying for this is hard.

More than likely the bike is fine since most of chips only go to the primer and the bigger chip while at the carbon doesn't; seem to be frayed or jagged. If you feel comfortable doing so I would at the bare minimum seal the area with some sort of topcoat to prevent further paint chips in that area and also protect the carbon from water. A more advanced thing would to fill the pockets with resin, sand, and then possible repaint

With the information that the bike was NOT crashed but fell on furniture, it's VERY unlikely the carbon is actually damaged. Unsightly sure, this would drive me nuts but unless the bike was smashed into the furniture it would appear cosmetic but due indeed at least cover the area with clear coat or try to paint match the area

Last edited by Jrasero; 03-25-21 at 11:30 AM.
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Old 03-25-21, 11:27 AM
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Originally Posted by Cassopher View Post
It wasn’t a rider involved crash. Our toddler knocked it over and it crashed into a piece of furniture.
Then that isn't a crash. It fell over.
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