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I thought these plastic bikes were supposed to shatter into a thousand pieces?

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I thought these plastic bikes were supposed to shatter into a thousand pieces?

Old 12-07-12, 08:21 AM
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sykerocker 
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I thought these plastic bikes were supposed to shatter into a thousand pieces?

Thought the gang might be entertained by the following. Especially those die-hard steel believers who really believe that dropping a carbon fiber frame once means it's headed to the trash can:

http://www.youtube.com/watch?v=7ZmJtYaUTa0

The outtakes are equally entertaining. Gee, it holds up like a steel bike (it's a Pinarello Dogma):

http://www.youtube.com/watch?v=Ee54EP-nho4

And an earlier video riding a Raleigh Avanti Team:

http://www.youtube.com/watch?v=5z1fSpZNXhU
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Old 12-07-12, 08:56 AM
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Excellent! Pure grace...swami Luker predicts expensive medicals, though, in this guy's future...I come from his future!
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Old 12-07-12, 09:01 AM
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JMO, but I don't believe anyone argues with the fact that CFRP has the highest strength-to-weight ratio of any of the commonly used frame materials.

The "shattering" reputation comes from CFRP's failure mode. When it does fail, it usually does so rather spectacularly. This is due to its very low elongation. Experience has taught good builders to beef up the highly stressed areas of the structure with more material, mitigating the low elongation problem, but it's still there.
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Old 12-07-12, 09:13 AM
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Gee, how many threads have we had linking to these videos? They almost qualify for a sub-forum.
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Old 12-07-12, 09:15 AM
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Yeah old news.
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Old 12-07-12, 09:56 AM
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I just handled a claim on a 2011 Trek Speed Concepts, WSD. Full carbon frame and fork.
It was mounted on the back of an SUV and the car behind them rear-ended the SUV.
The impact threw the bike through the back window of the 2012 4-Runner.

1-The standup hitch rack allowed the bike to launch.
2-Full impact was on the crankset, bending one spider arm.
3-I found a seat scuff, an RD scuff, and a notch on the FD cage from the chain.
4-The wheels trued back up, but are probably bent.
5-We could not find any damage on the frame at all. One tough frame.
(The 4-Runner will need a complete rear liftgate assembly, looks like aluminum foil)

I considered the bike a total loss, because if there was a hairline crack at the RD hanger or something, it would be a hassle down the road. I paid her for it and the bike rack, which was the extent of my assignment. She's riding a 3/4 Ironman this weekend. She "bought back" the damaged bike, also, and it would not surprise me if she tosses a new crankset on it, borrows a set of wheels, and rides it. That's what I'd do, and if it breaks in the future, so be it, she still has the money.

I also found her a NOS exact replacement on line for $916 if she wants it. I think she's going the P3 route, eventually.
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Old 12-07-12, 11:06 AM
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I agree that newer cf frames are a lot tougher than many people give credit. But a big drawback is that they hide severe damage very well and why I would never buy a used cf frame from anyone I did not completely trust. There is no way I would ever ride a cf bike that took that kind of impact. I wouldn't call it no big deal, as others have noted, when a cf frame fails it does so spectacularly. Going at speed on a technical decent and having the rear hanger blow out would be a very big and possibly fatale deal. If she has the money why take such a risk.

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Old 12-07-12, 11:55 AM
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Originally Posted by kaliayev View Post
But a big drawback is that they hide severe damage very well
Do what the QC guy at Kohler does. After every porcelain toilet bowl and sink comes out of the firing oven, a guy with a large steel ball, about 2 inches in diameter, taps each product in several places. If teh ring is clear, the product is good. If the ring is deadened, there is a crack and the product is rejected.
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Old 12-07-12, 12:24 PM
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Carbon always sounds dead to me.
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Old 12-07-12, 05:32 PM
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it always works when I do it: one thousand pieces +/-...I admit I use a pretty big hammer
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Old 12-07-12, 06:02 PM
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Well, if I ever do get a crabon fribe velo, I know which one I'm getting! That's a pretty strong testimonial.
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Old 12-07-12, 06:26 PM
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34,000+ miles on our full carbon fiber tandem.
So far, so good.
But . . . have broken 2 steel tandem frames (once at 50,000 miles and once at 56,000 miles) and one experimental steel fork at 13,000 miles.
Anything can/will eventually fatigue/fail.
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Old 12-07-12, 06:49 PM
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Originally Posted by iab View Post
Do what the QC guy at Kohler does. After every porcelain toilet bowl and sink comes out of the firing oven, a guy with a large steel ball, about 2 inches in diameter, taps each product in several places. If teh ring is clear, the product is good. If the ring is deadened, there is a crack and the product is rejected.
Funny, you'd think he'd hear a splash.
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Old 12-07-12, 06:56 PM
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Originally Posted by kaliayev View Post
I agree that newer cf frames are a lot tougher than many people give credit. But a big drawback is that they hide severe damage very well and why I would never buy a used cf frame from anyone I did not completely trust. There is no way I would ever ride a cf bike that took that kind of impact. I wouldn't call it no big deal, as others have noted, when a cf frame fails it does so spectacularly. Going at speed on a technical decent and having the rear hanger blow out would be a very big and possibly fatale deal. If she has the money why take such a risk.
That's exactly why I simply paid for the bike.

This guy hit a guardrail, so it wasn't hidden....
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Old 12-08-12, 01:33 AM
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Originally Posted by kaliayev View Post
Carbon always sounds dead to me.
.....................The stuff makes great fly rods.
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Old 12-08-12, 01:48 AM
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this one got a lot more replies than the thread the other day with this video. still a cool video
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