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PostPosted: Thu Aug 16, 2012 1:38 pm 
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Location: Nashville, TN
I crashed out of a criterium last night. 90 degree right hand turn and went down fast and sudden. Too sudden to register any kind of loss of grip. When I went to rejoin I felt a thumping coming from the rear. Thought it was a bent wheel, but noticed a section of the bead, probably about 10 cm, had unseated from the wheel but maintained pressure. I'm now wondering if the bead was displaced from the crash or if there is a chance it was the cause. Right hand turn, I went down on my right side and the bead popped off on the left side of the wheel. When I told people what had happened, the first question they're asking is if it was a Conti.

I had inflated the tires to 110 psi before leaving the house, air temps were lower last night than the rest of the summer. It's a weekly series and the fourth race on the tire. Wheelset is Mavic R-Sys SLR.


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Posted: Thu Aug 16, 2012 1:38 pm 


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PostPosted: Thu Aug 16, 2012 2:33 pm 
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Location: uk
id say displaced by crash ..

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PostPosted: Thu Aug 16, 2012 5:05 pm 
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Probably happened in the crash. But it can happen on its own theoretically. I had it happen twice, both times on Michelins. that is why I never use them any more.
I have never had it happen on a Conti.
Most people complain that Conti beads are way too tight. I will accept tight as long as they never come off. :D


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PostPosted: Thu Aug 16, 2012 7:53 pm 
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That's perfect, I was about to put a Pro3 on it. Just a bit confused, we use the same crit course every week, and between races and warmups I've probably gone around that turn hundreds of times without drama. Nothing different this time, just wound up on the ground. I thought at first that maybe I was trying to close a gap through the turn and unweighted the rear, but I just looked at my power meter data and I had coasted through the turn, zero cadence, zero power, 22.4 mph to 0 in one second.


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PostPosted: Thu Aug 16, 2012 8:44 pm 
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I doubt it was the crash. I had the same thing happen last year during a flat, straight road race and also once during training. This year a teammate had a bead separate during a ride as well. Lastly, a friend had it happen on his first ride on some brand new GP4000s. In all of our cases we felt a lump and a thumping of the wheel and then a loud blow out after. Only my friend with the brand new tires got a warranty replacement.

There is no crash that I'm aware of that would ever rip a bead apart. A clincher would simply pull off of the rim. If it were flat spotted it would have to lock up pretty hard and rip through the entire casing, but that wouldn't involve the bead.

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PostPosted: Thu Aug 16, 2012 9:12 pm 
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Had Hutchinson Fusion blow off Ksyriums on a hot day but never Contis


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PostPosted: Thu Aug 16, 2012 9:22 pm 
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I'd wager that the great majority of the cases of a tire blowing off are due to tube installation. If a little bit of tube gets caught under the bead, then it can blow the bead off the rim when the opportunity arises... higher temperatures, cornering forces, etc. It's more likely to happen with latex tubes.

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PostPosted: Thu Aug 16, 2012 9:28 pm 
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I should mention that my problems with Michelins were NOT with the Pro Race 3 or 4. It was probably 10-15 years ago, and I don't remember which model it was.

I actually have used some Michelin Pro Race 3 in the past year. I didn't like them because they wore fast and seemed to cut easily, but they didn't blow off the rim.


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PostPosted: Thu Aug 16, 2012 10:08 pm 
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KWalker wrote:
I doubt it was the crash. I had the same thing happen last year during a flat, straight road race and also once during training. This year a teammate had a bead separate during a ride as well. Lastly, a friend had it happen on his first ride on some brand new GP4000s. In all of our cases we felt a lump and a thumping of the wheel and then a loud blow out after. Only my friend with the brand new tires got a warranty replacement.

There is no crash that I'm aware of that would ever rip a bead apart. A clincher would simply pull off of the rim. If it were flat spotted it would have to lock up pretty hard and rip through the entire casing, but that wouldn't involve the bead.


In my case the bead didn't rip apart or separate, it just unseated from the wheel. I released some of the pressure and was able to seat it back onto the wheel with my fingers. Seems fine now, but it did get me thinking about how easy it is to roll Conti's on to my wheels. It makes it easier when changing tires, especially flats on the road, but maybe for peace of mind I'll try something that's a little more difficult to get on. I've put off doing the Michelins because last time I tried to mount them they were a real struggle to get on, but I think I have the motivation now to try them out. I'll probably never know which caused what, but at this point the only variable is the tire, so I'll at least take that out of the equation by replacing it.


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Posted: Thu Aug 16, 2012 10:08 pm 


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PostPosted: Fri Aug 17, 2012 3:25 am 
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I'm the opposite- Michelins slide on easy but Contis suck.

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