Possible Frame Damage?
02-05-19 | 04:24 AM
#1
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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.
I’m 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.
I’m 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.
02-05-19 | 04:56 AM
#3
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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.
02-05-19 | 05:26 AM
#4
Senior Member
Joined: Nov 2014
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From: Eugene, Oregon, USA
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.
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.
02-05-19 | 08:59 AM
#5
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Bikes: Propel, red is faster
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.
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.
02-05-19 | 09:14 AM
#6
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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.
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.
02-05-19 | 12:02 PM
#10
Generally bewildered
Joined: Aug 2015
Posts: 3,038
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From: Eastern PA, USA
Bikes: 2014 Trek Domane 6.9, 1999 LeMond Zurich, 1978 Schwinn Superior
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.I’m 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.
But if you don't even see paint damage there is not likely any observable change anywhere.
02-06-19 | 06:20 AM
#13
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02-09-19 | 12:20 PM
#14
Occam's Rotor
Joined: Jul 2013
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(But I have never owned carbon, except for what is included in steel.)
02-09-19 | 04:26 PM
#15
Senior Member
Joined: Dec 2015
Posts: 207
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From: Norcal
Bikes: Moots Vamoots RSL 2018, Passoni Titanio 2020
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.
