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Carbon Fiber Damage?

Old 05-30-21, 01:35 PM
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helmet4000
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Carbon Fiber Damage?

Bought a NOS Kestrel Talon (nice SRAM rival). Probably 2010/2011 era. Was otherwise new in original Kestrel box, not sure if damaged during shipping. Have not ridden. Damage to seat stay. I tapped a penny along the seat stay (both sides for comparison), over the part showing visual damage the tone seems to get lower. Tone is sounds consistently pitched on other (non-damaged) side. Does the discoloration mean anything? Does it appear cosmetic?

What would you do? Send it back or ride it? (Not interested in dying so will probably send back).

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Old 05-30-21, 01:48 PM
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shelbyfv 
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I vote "send it back."
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Old 05-30-21, 01:51 PM
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I'd send it back.

I did a 1218 km Grand Randonnee with this weird, new creaking noise. I thought it was my BB. Afterwards, I discovered that half of the carbon left seat stay was crushed by the airlines on the flight overseas. I got it fixed by Calfee when I got home. They did a perfect job. Absolutely perfect.
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Old 05-30-21, 02:56 PM
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Seattle Forrest
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Send it back.
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Old 05-30-21, 03:18 PM
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cxwrench
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Send it back, looks like damage to me. And sounds like it from your tap test.
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Old 05-30-21, 03:20 PM
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To be honest it's hard to tell from your photo. If it looks like it's been crushed or gouged then I would send it back. If it's just a surface scrape then it will probably be okay. But can't really tell from your photo.
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Old 05-30-21, 03:28 PM
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Something like that is not expected with NOS.

Unfortunately, bikes are routinely poorly packed in bike boxes.
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Old 05-30-21, 03:42 PM
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Originally Posted by cxwrench View Post
Send it back, looks like damage to me. And sounds like it from your tap test.
Man these new carbon bikes are nice.

But when I see stuff like this they just freak me out...
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Old 05-30-21, 03:59 PM
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Originally Posted by zandoval View Post
Man these new carbon bikes are nice.

But when I see stuff like this they just freak me out...
Carbon bikes are not a new thing. They date back to the mid 80s and have been mainstream now for a couple of decades.
Don't get freaked out. They are pretty tough:-

https://www.yellowjersey.co.uk/the-d...-bicycle-weak/
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Old 05-30-21, 05:59 PM
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Tap testing can indicate if further investigation is needed. It's rarely as conclusive as people make it sound. In the aircraft situations that I have had to use it, the false positives and negatives make me mistrust it. More precise methods would be to 'flex' it and listen, and finely scrape it to see any cracks. Of course, if you have the option to send it back or have a professional look at it definitely use the option. It is far from end of the line though. Depending on how interested you are, there are certified shops who fix carbon frames. In fact carbon is one of the most repairable materials given the right means.
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Old 05-30-21, 06:26 PM
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It's harder in a situation like this with old, unmolested items that aren't being made anymore and may not be replaceable. But that describes your teeth too. 🙂
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Old 05-30-21, 06:45 PM
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helmet4000
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Originally Posted by Seattle Forrest View Post
It's harder in a situation like this with old, unmolested items that aren't being made anymore and may not be replaceable. But that describes your teeth too. 🙂
I read that the "tap test" is nowhere near perfect as noted above. But I don't want to take a chance. It is a Kestrel Talon with a 53/39 crankset so it would be ridden at high speeds and I don't want to have to pay for dental implants lol.
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Old 05-30-21, 08:39 PM
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Another vote for sending it back. Bike is not worth a ton of money and while cool it is NIB I wouldn't risk it for that one.
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Old 05-30-21, 10:04 PM
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Originally Posted by helmet4000 View Post
I read that the "tap test" is nowhere near perfect as noted above. But I don't want to take a chance. It is a Kestrel Talon with a 53/39 crankset so it would be ridden at high speeds and I don't want to have to pay for dental implants lol.
The 'tap' test is very accurate for bicycle frames. They're thin, hollow, and you can get a good visual as well. In this case I would trust it with a high degree of certainty.
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Old 05-31-21, 07:16 PM
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1) my bet looking at the pic is it will be ok;
2) even if a single stay fails, it’s not likely to cause a catastrophic accident;
3) it’s not right and not what you paid for, so I spite of 1 and 2, I’d send it back.
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