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Video: CF failure

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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

Video: CF failure

Old 09-17-19, 10:58 AM
  #26  
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Originally Posted by bruce19 View Post
I must be immortal....I'm riding steel.
Steel bike is why Mick Jagger is still alive at 200 despite all the drugs.
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Old 09-17-19, 10:59 AM
  #27  
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BTW, that Lanterne Rouge YouTube channel should be on your subscription list. That kid is good. Check out his race analysis videos. His insights and dissections are better than 90% of the broadcast commentators and analysts.
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Old 09-17-19, 11:04 AM
  #28  
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Originally Posted by canklecat View Post
BTW, that Lanterne Rouge YouTube channel should be on your subscription list. That kid is good. Check out his race analysis videos. His insights and dissections are better than 90% of the broadcast commentators and analysts.
When you got hours and hours to replay/rehash, most anyone can come up with a better dissection than the people on the spot.
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Old 09-17-19, 11:09 AM
  #29  
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Originally Posted by indyfabz View Post
That's why I change my fork after every ride.
Smart move. Probably more economical than buying an Ultrasound machine also. Those tuning forks can be expensive as well.
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Old 09-17-19, 11:22 AM
  #30  
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Still in awe of the rider's mental coolness throughout the incident. He realizes he is going to wreck, and does everything he can to minimize it. He had no choice, though.

I'm surprised that another view of the incident from the side has not surfaced. Maybe someone got paid a good chunk of change to not make it public.

Last edited by seypat; 09-17-19 at 11:27 AM.
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Old 09-17-19, 11:54 AM
  #31  
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Originally Posted by Chi_Z View Post
always use steerer compression plug that goes the full length of the stem clamp.
Yeah, about that advice.

I've heard it bandied about--usually as bike mechanic scuttlebutt--but I've never found a manufacturer publicly requiring it.

On the other hand, some manufacturers provide downright dinky compression plugs that couldn't possibly cover the stem clamp length. Like Cannondale:


I had an Easton fork that didn't even use a compression plug at all. Instead, it had an adjuster you installed under the stem on the outside of the steering tube, turning a screw to produce the preload:



So, has anyone seen written notices from manufacturers requiring these "full length" compression plugs?
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Old 09-17-19, 12:37 PM
  #32  
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I've seen some things over the years that would make this crowd go into perpetual fear of every piece of bicycle gear they have and never ride again.

We all can guess on all of this forever. One thing I do know from experience is that punk cat 1/2 pro kids think they're invincible and care little to nothing about the actual tech and more about how cool something looks. I would place a bet on whether that setup had a spacer or not and I am siding on the side of not....because "slam it" and stuff. not only that but most of the gear in any race at that level of ability has been in some sort of a wreck. Just has. No team is using ultrasound to inspect anything. *shrug*

I'm sorry but my first reaction when watching the original race clip was to laugh. It's probably because I have seen enough wrecks to just intuitively know that guy made it out with little by way of injury. He was lucky. His bars were mushy for a while though so....
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Old 09-17-19, 12:53 PM
  #33  
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Originally Posted by seypat View Post
Still in awe of the rider's mental coolness throughout the incident. He realizes he is going to wreck, and does everything he can to minimize it. He had no choice, though.

I'm surprised that another view of the incident from the side has not surfaced. Maybe someone got paid a good chunk of change to not make it public.
Yeah, the more you watch the videos, the more impressive the riding is -- mostly his, but also the guy between him and the barriers who leans against him and stays upright early on.

The rider who crashed was using his rear brake, despite the bars being detached. If you watch the video closely, his back wheel is locked up when he's doing that fish tail skid back and forth. It looks like me might be also consciously trying to use the bars to reach down to manually steer his front wheel, but not sure about that. In any case, he was fully in mental control of his body and reacting so well to the chaos of his broken bike. Watch his face and concentration -- he's still riding the bike all the way to the ground. Super impressive.
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Old 09-17-19, 01:23 PM
  #34  
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Originally Posted by ljsense View Post
Yeah, the more you watch the videos, the more impressive the riding is -- mostly his, but also the guy between him and the barriers who leans against him and stays upright early on.

The rider who crashed was using his rear brake, despite the bars being detached. If you watch the video closely, his back wheel is locked up when he's doing that fish tail skid back and forth. It looks like me might be also consciously trying to use the bars to reach down to manually steer his front wheel, but not sure about that. In any case, he was fully in mental control of his body and reacting so well to the chaos of his broken bike. Watch his face and concentration -- he's still riding the bike all the way to the ground. Super impressive.
Not taking anything away from his bike handling skills here, but the cables are all being stretched to the max once the bar breaks off. The rear wheel probably locked up on it's own because of that, and not because the rider was applying the lever.
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Old 09-17-19, 01:31 PM
  #35  
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Originally Posted by Psimet2001 View Post
He was lucky. His bars were mushy for a while though so....
This is the most surprising (and impressive?) thing about this video to me. His bars are visibly loose almost as soon as he comes into the frame. You see him look down at them as they're wobbling around 2 seconds into the video, and he takes at least 5-6 more pedal strokes before they break off.
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Old 09-17-19, 01:39 PM
  #36  
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He was probably looking for Cavendish along the wall to use as a buffer. Give him an elbow and get some support. He wasn't there, so he used the other guy.
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Old 09-17-19, 02:33 PM
  #37  
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One thing that can damage a steerer tube that few mechanics consider is the clamp used to guide the cut saw when it's shortened.

Take a spare length of carbon steer tube you've got laying around and clamp it up tight with a Park steer tube cut guide. If you use the force that might feel right from clamping a piece of wood that's going to be sawn, you'll see it will totally deform the thing.

Over clamping a steer tube when you're cutting it is a sure way to crush some of the carbon.
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Old 09-17-19, 07:28 PM
  #38  
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Originally Posted by ljsense View Post
One thing that can damage a steerer tube that few mechanics consider is the clamp used to guide the cut saw when it's shortened.

Take a spare length of carbon steer tube you've got laying around and clamp it up tight with a Park steer tube cut guide. If you use the force that might feel right from clamping a piece of wood that's going to be sawn, you'll see it will totally deform the thing.

Over clamping a steer tube when you're cutting it is a sure way to crush some of the carbon.
I always got a straighter cut leaving the guide out of it and following a bit of tape with the Dremel anyway... Those guides don't work too well.

That's another thing - even with the diamond blade in the hacksaw, it's still possible to splinter the cut. Not with a Dremel. But then there's the dust...
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Old 09-17-19, 08:15 PM
  #39  
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I once had an aluminum stem break on me. I'd just finished a somewhat technical descent up to 40 mph, was on the flat and crossing RR tracks when I felt the stem get wobbly. I sat up, took all the pressure off, and managed to ride the thing another 10 miles. Weld failure. I admit to enjoying sprinting and really pried on the bars back then. I also had a steel bike, threaded stem, which felt like I was going to rip the bars right off the bike. Good thing I never did. I also had a stem bolt break in the parking lot before a populaire, different stem. I was doing my usual "torture test everything before the ride." Bontrager later recalled that stem. I drove home, got my spare bike, came back and started ~59' late, still managed to finish in the middle of the strung-out riders. Those were good days. I don't break anything anymore.

I wrote to the broken stem's manufacturer, explained how it had failed, no answer. Not on the market anymore, anyway.
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Old 09-18-19, 01:40 PM
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Ouch!! That sucks
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Old 09-18-19, 07:39 PM
  #41  
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Originally Posted by Seattle Forrest View Post
I think this video proves that everyone who rides a carbon fiber bike will die someday.
Good to know, I won't be alone...
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Old 09-18-19, 07:44 PM
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Originally Posted by indyfabz View Post
That's why I change my fork after every ride.
I put mine in the dishwasher, wait, that isn't right. Never mind.
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Old 09-18-19, 11:19 PM
  #43  
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Another reason to ride steel.
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Old 09-19-19, 06:35 AM
  #44  
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Originally Posted by Jon T View Post
Another reason to ride steel.
Jon
CF = 5-10x stronger than steel. Improper maintenance and/or manufacturer defect is the culprit here.
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Old 09-19-19, 07:39 AM
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Originally Posted by Jon T View Post
Another reason to ride steel.
Jon
steel frame breaks too
My Flaanimal straight up cracked!
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Old 09-19-19, 09:37 AM
  #46  
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Originally Posted by Jon T View Post
Another reason to ride steel.
Jon
Another good reason to never ride any kind of bike!!
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Old 09-19-19, 11:42 AM
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Originally Posted by Seattle Forrest View Post
Another good reason to never ride any kind of bike!!
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Old 09-19-19, 07:45 PM
  #48  
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Rumor is it was sabotage by another team.
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Old 09-19-19, 10:22 PM
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Well, you definitely shouldn't ride a bike somebody is sabotaging. That's the take home message from this thread.
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Old 09-20-19, 09:09 AM
  #50  
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Originally Posted by Seattle Forrest View Post
Well, you definitely shouldn't ride a bike somebody is sabotaging. That's the take home message from this thread.
What I took away from it was that I'm not getting involved in a bunch sprint unless I get paid for doing so...but I already knew that before seeing the video.
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