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Is my carbon frame on its way out?


ebenvn

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2 1cm x 1cm pieces of tube glued to the spot and bobs ur auntie!!!! I can upload a pic of the damage to my frame and my sollution if you want?

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Thx Capricorn, hope your right! (maybe I should use it as an excuse to get a new frame..... :D )

 

+1. I think you should use the excuse to get a new frame. Its so simple. It could break at an given time and cause you serious bodily harm. Well at least thats what you tell the missus.

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Thanks for all the input guys. No, its on the top, below the bottle cage. Im currently using Specialized cages... Thx for the repair advise. Ill have a look if it is the bottle. I also only use 1 cage so could just use the other one as well.... This picture should give a better idea:

post-20111-0-96398300-1325352988.jpg

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+1. I think you should use the excuse to get a new frame. Its so simple. It could break at an given time and cause you serious bodily harm. Well at least thats what you tell the missus.

 

Hahaha, finally someone agrees! Thx Super Mario - let me see if that works...

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Okay not a projectile off the front tyre but still looks like an impact. There are guys who specialise in Carbon Fibre repairs, they will be able to sort that you. Wouldn't suggest DIY.

 

btw, have you seen the machine that 'weaves' these tubes?

 

http://youtu.be/KfQGtYG7zg8

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Hi EbenVN

 

Take a coin and tap the frame around the dent and then on the dent. Around the dent it should give you a nice hollow sharp tick tick tick sounds. Now if you tap the dent and it makes a similar tick tick tick sound then no worries it is structurally the same as the rest of the frame in this area. However, if it becomes a dull doof doof sound then the carbon fivres have been damaged or have delaminated. If it is damaged, it does still not mean the end of the world as it all depends on the nature of the damage.

 

My guess is no damage, but if there is write back and let me know.

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A team mate had exactly the same issue - the bottle in the cage on the seat tube of his road bike fell/pushed through the cage and rubbed a groove into the top of the down tube. Culprit was the Specialized cage, in his case.

 

My guess about the OP's frame is it only rubbed through the outer epoxy clear coat, which is not a structural problem. The manufacturer drills 2 big holes to mount the bottle cage right through the down tube close by, which would have a much bigger impact on the structure than the rub mark. If those holes don't case failure, a small rub mark would not, either.

 

To play it safe, measure the length and width of the mark now, and note it somewhere. Do it again after each of your next 5 rides - if the dimensions of the mark increase, it is serious. If no change, thereafter measure it once a month.

 

If it does not change after a couple of months, perhaps have a buisiness that does composite work fill the thing up with a bit of clear coat and polish it smooth. (do not do this right away else you can't monitor the mark to see if it gets bigger)

Edited by Christie
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Thx, I will try the coin test tomorrow and give you the feedback. I have actually seen someone testing a frame like that for a crack.... :blush:

 

Ok, Christie - I'll monitor it for a while and check it again. But you make a very valid (and obvious!) point about the cage holes...

 

Ill check the position of the bottle tomorrow. If thats the case it wont be an issue, I was just worried its the frame starting to fail at this spot :o

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And you thought tappeology was a dying art?

 

i guess u inadvertently shot the theory to pieces using the critical word "art". implying the effort of a one well versed in the act.

 

eben: alu or carb frame testing? An alu frame for sure, because it cracks all tehw ay thru the material. it's very thin to begin with. A carbon frame is not easy to test using a tap test because material is often layed up in various directions to enhance strength. In the that instance, thru cracks are highly unlikely as it's the multi directional layup that prevents cracking. So this tap testing could yield highly unreliable results unless the tap tester knows exactly what to look for. changes in sound.. sorry. highly suspect 'method' that could only make u worry for nothing. Unless you willing to take anything as motivation for a frame upgrade ;)

Edited by Capricorn
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i guess u inadvertently shot the theory to pieces using the critical word "art". implying the effort of a one well versed in the act.

 

eben: alu or carb frame testing? An alu frame for sure, because it cracks all tehw ay thru the material. it's very thin to begin with. A carbon frame is not easy to test using a tap test because material is often layed up in various directions to enhance strength. In the that instance, thru cracks are highly unlikely as it's the multi directional layup that prevents cracking. So this tap testing could yield highly unreliable results unless the tap tester knows exactly what to look for. changes in sound.. sorry. highly suspect 'method' that could only make u worry for nothing. Unless you willing to take anything as motivation for a frame upgrade ;)

 

I was actually thinking of varying my grip to get a different sound and thus warrant a new frame! :lol:

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