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Possible Frame Damage?

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Old 02-05-19, 04:24 AM
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DefUnct
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Possible Frame Damage?

Hi, a larger partially rubber coated metal hook that was screwed to the wall above where my bike stands recently came out and dropped onto the top tube of my carbon road bike (closer to the seat tube). I dont know what hit - the metal part, rubber part or the screw with rawl plug that came out with it :-D I cant see any damage, and the hook only weighs about 80g.

Iím curious if something like that could cause any major damage to the frame? The reason i ask i more because of the shock to a small point rather than force in total to frame.



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Old 02-05-19, 04:52 AM
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dabac
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If you can't even see a chip in the paint/clearcoat, don't worry about it.
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Old 02-05-19, 04:56 AM
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DefUnct
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Originally Posted by dabac View Post
If you can't even see a chip in the paint/clearcoat, don't worry about it.
thanks, there are some minor ones - trouble is i know there were some before and am not certain which are new, if any - suspect they are all old. They are just clear coat or red top layer, nothing major.
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Old 02-05-19, 05:26 AM
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CliffordK
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You might try the "coin test".

Lightly drop the edge of a coin along the tube in the presumed affected area. A change in the sound, or a hollow sound would be worrysome.

I presume the tube will be OK, but keep an eye on it for cracks, noises, or changes developing.
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Old 02-05-19, 08:59 AM
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burnthesheep
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There's lots of youtube vids about the "coin" thing even from reputable repair shops.

I tried it on something I knew had damage and you had to be darn near perfectly on top of the known and visible crack to hear the change.

I tried it on another bike with a much more involved repair job, and it worked. Get near the dime sized HOLE and the pitch changed.

If there aren't any paint imperfections the coin trick might not even work.

I'd ride it as-is and set a reminder to inspect it each week for a few months, visual check.

That's all.
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Old 02-05-19, 09:14 AM
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I agree with burnthesheep. If it looks fine, it probably is fine.

My 10+ year old Tarmac has numerous rubs, dings, and scuffs on the cf frame, some quite deep. It hasn't exploded yet.

But this post does highlight one of the issues with cf: damage can be invisible, though it is probably rare. You generally don't have that problem with steel, unless it is rusting inside the tubes.
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Old 02-05-19, 09:32 AM
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86az135i
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if an 80g coated lag hook falls onto your bike breaking the frame...it should have broken long before that.
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Old 02-05-19, 10:02 AM
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Milton Keynes
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But if something falls on it again, it will asplode.
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Old 02-05-19, 11:42 AM
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Others have claim carbon is not fragile.
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Old 02-05-19, 12:02 PM
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Originally Posted by DefUnct View Post
Hi, a larger partially rubber coated metal hook that was screwed to the wall above where my bike stands recently came out and dropped onto the top tube of my carbon road bike (closer to the seat tube). ... I cant see any damage, and the hook only weighs about 80g.Iím curious if something like that could cause any major damage to the frame? The reason i ask i more because of the shock to a small point rather than force in total to frame.
Yes, it could, but ...

Originally Posted by dabac View Post
If you can't even see a chip in the paint/clearcoat, don't worry about it.
My LBS told me the story of a guy who was using a brass plumb bob with a sharp point to do bike fitting. These weigh maybe 8 ounces, and the point should be hardened steel. He dropped than on the customer's new frame. There was a divot. THAT was a problem.

But if you don't even see paint damage there is not likely any observable change anywhere.
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Old 02-05-19, 12:09 PM
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CliffordK
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Or, if there are other paint chips, perhaps there were more serious previous insults to the frame integrity than the most recent incident.
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Old 02-05-19, 10:12 PM
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MikeyMK
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Sell it on and get a steel frame.
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Old 02-06-19, 06:20 AM
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downhillmaster
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Originally Posted by MikeyMK View Post
Sell it on and get a steel frame.
This.
Sell it immediately and get a steel frame that you donít have to constantly worry about, even after a safe falls out of a second story window onto it.
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Old 02-09-19, 12:20 PM
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Originally Posted by downhillmaster View Post

This.
Sell it immediately and get a steel frame that you donít have to constantly worry about, even after a safe falls out of a second story window onto it.
The only frame I ever broke was steel.

(But I have never owned carbon, except for what is included in steel.)
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Old 02-09-19, 04:26 PM
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Boerd
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I thought people who buy carbon frames trust them to no end. If you worry this much about it - change to titanium and enjoy your bike.

Last edited by Boerd; 02-09-19 at 04:52 PM.
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