Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Carbon fiber fail

Old 09-26-15, 06:39 PM
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c_bake
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Carbon fiber fail

Earlier today during the race in Richmond.
I suppose even the high end stuff can fail.




Last edited by c_bake; 09-26-15 at 06:52 PM.
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Old 09-26-15, 06:49 PM
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Ouch!
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Old 09-26-15, 06:59 PM
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I was watching that race and somehow missed that wreck.
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Old 09-26-15, 06:59 PM
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I must be missing something. I don't see what failed.
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Old 09-26-15, 07:00 PM
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The 'ol snapped carbon steerer tube. I believe the last one I saw was in the TOC this summer. At least they're a few grams lighter than aluminum so you can ride faster.
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Old 09-26-15, 07:04 PM
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Thanks! I totally missed the handlebar displacement. As has already been said, "OUCH"...
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Old 09-26-15, 07:12 PM
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Super-light and cobblestones are seldom a good match.
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Old 09-26-15, 07:17 PM
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I hope you not hurt.
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Old 09-26-15, 07:26 PM
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Originally Posted by JohnDThompson View Post
Super-light and cobblestones are seldom a good match.
Probably didn't have a torque wrench...
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Old 09-26-15, 07:31 PM
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Originally Posted by gregf83 View Post
Probably didn't have a torque wrench...
I think over tightening would be the cause of this type of failure.
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Old 09-26-15, 07:49 PM
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Originally Posted by JohnDThompson View Post
Super-light and cobblestones are seldom a good match.
I'm looking at all the bikes that didn't fail… seems like an illogical statement.
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Old 09-26-15, 07:59 PM
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That's more reason not to dismiss the dangers of using top end stuff for regular rides, the pro get their gear replace regularly so at the earliest sign of danger, the gear gets replaced. Regular riders don't inspect their gear that often so buying the latest, lightest gear just seems spendthrift.

I rather get something reliable and reasonably light but not push the envelope for the lightest gear.
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Old 09-26-15, 08:32 PM
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Must be counterfeit frame from alibaba
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Old 09-26-15, 08:35 PM
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Originally Posted by rms13 View Post
Must be counterfeit frame from alibaba
Asplosive allegation...
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Old 09-26-15, 08:57 PM
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Most of you guys are missing the point so hard it hurts. This is tantamount to people saying vaccines cause autism because of that one study which was later debunked. In this case, you find 2 or 3 examples or anecdotes of a steerer tube snapping which can very, VERY easily be attributed to over-torqued components while simply ignoring the hundreds of thousands of bicycles that enter the very same competitions without asploding. I think it was the Tour of Flanders earlier this year, but I loss count of how many wrecks there were. I don't remember seeing a single broken bike in all that carnage.

So the thread title should read "mechanic fail" rather than "carbon fail."
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Old 09-26-15, 09:00 PM
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Chinese crabon asplodes --- here's the proof!
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Old 09-26-15, 09:02 PM
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Did he ring his bell though
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Old 09-26-15, 09:22 PM
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He might have been in a crash a few minutes earlier that did the damage.
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Old 09-26-15, 09:26 PM
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Lol you guys crack me up.. i bet you guys ride tanks that never have any mechanical problems. The pic is from the world championships. which none of you will ever compete in. they are likely racing at the highlight of their lives and careers trying to have any edge they can. They can ride no hands up Libby hill faster than most of us.

sure hope you don't fly cuz that is a lot of carbon fiber in that plane
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Old 09-26-15, 09:42 PM
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Originally Posted by c_bake View Post
Earlier today during the race in Richmond.
I suppose even the high end stuff can fail.
Of course it can. Anything can fail, no matter what it's made of, or the level of quality.
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Old 09-27-15, 04:44 AM
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Yes, it must have been overtorqued. There can be no other explanation because carbon doesn't have a history of just failing
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Old 09-27-15, 05:02 AM
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Oh snap.

I hope he is ok.
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Old 09-27-15, 05:29 AM
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Clearly this is rider error as it looks like he was trying out a new extreme type of aero position for uphill cobblestone riding and was just too forward, putting untold-catastrophic pressure on said carbon fiber steerer tube.

Last edited by Fldaves; 09-27-15 at 05:38 AM.
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Old 09-27-15, 05:53 AM
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Overtorque, micromovements in junction between stem and steerer tube. First the steerer develop cracks and after that it may just snap off.
I've seen it at my own bikes using a sharp edged aluminium stem. Two steerers cracked which i luckily noticed before i did what this dude did.

Last i was informed is that one mistake easily done is setting torque to maximum allowed. We should torque stem enough and that may come out lower than given maximum torque. These days i use a small torque wrench from Ritchey for stems. So i can feel when stem has enough torque. Using a larger torque wrench may hinder "the feel" when the stem actually has enough torque. Ofcourse this is same for most parts of the bike which are low torque components. (stem, handlebar, seat post, brakes aso...)

Some cranks aswell as cassette is 30-40Nm so that is a different story.

Last edited by Avispa; 09-27-15 at 05:57 AM.
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Old 09-27-15, 06:21 AM
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yeah, but atleast he can take it back to the dealer for diagnosis or sue the manufacturer if he wants
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