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PostPosted: Mon Sep 10, 2012 6:36 pm 
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Joined: Mon Mar 28, 2011 8:06 am
Posts: 13
Location: Bay Area, CA
Sad day for a ride. :cry:

Tires: Continental GP 4000s
Tubes: 72g Forte inner lightweight tubes
Wheels: Zipp 404 Firecrests clinchers
Tire Pressure: 110psi

I went out yesterday for a sunday ride with my brother and less than half mile into the ride. Going 25-30mph I hear LOUD pop from my rear wheel, the back starts to fishtail then the rear wheel is locked up and grinding against the road. I manage to stop and in my head I'm thinking it's a tube blowout. I look at the rear wheel and see the whole sidewall of the tire split wide open. The inner tube ejected out of the tire when it burst and wrapped around my hub and brake cause the rear wheel to lockup. Plus the inner tube is still inflated, full of air!
Some more info, I've ridden 380 miles(logged from strava) on this bike/tires, never had a flat on them. Rode a century with no problems. I'm more in shock because I've seen some big gashes and cuts on tires but never seen a tire burst open like this. I just feel like I'm in a crap situation. I'm Bringing the bike into the dealer and hoping for the best. The pictures say much more

Image

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PostPosted: Mon Sep 10, 2012 6:38 pm 
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Location: Aarhus, Denmark
Looks like a failure due to manufacturing errir.
Sure looks bad...

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Posted: Mon Sep 10, 2012 6:38 pm 


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PostPosted: Mon Sep 10, 2012 6:42 pm 
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Joined: Fri Mar 16, 2012 1:49 pm
Posts: 136
Location: LA/OC, California
Wow, talk about bad luck. Glad you're safe. The wear indicators are practically brand new.

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PostPosted: Mon Sep 10, 2012 7:04 pm 
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in the industry

Joined: Sat May 12, 2012 7:25 pm
Posts: 1416
Location: Glermsford, Suffolk U.K
I have seen once the bead on these tyre pop out of the carcass causing a similar problem to this. I am running these tyres also at the moment. I hope bad luck is not going around.

I did have one of my supersonic tube go bang on me during a ride. It split at the seam, nothing went through the tyre. Maybe the bad luck is going around.

Glad your safe.

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PostPosted: Mon Sep 10, 2012 7:06 pm 
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Joined: Mon Jan 23, 2006 6:35 am
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Location: New York
I have the same exact ones. Looks like a manufacturing failure.

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PostPosted: Mon Sep 10, 2012 7:34 pm 
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Location: Los Angeles / Glendale, California
Damn, that sucks.

Glad you're safe. Maybe Continental will send you a new one.

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PostPosted: Mon Sep 10, 2012 7:39 pm 
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Joined: Wed Jun 01, 2011 7:53 am
Posts: 303
Similar setup here too - 4000s clinchers with Reynolds 46 rims @ 110psi. No problems yet but your story is scary. I have about 1000 miles on mine and have been surprised to see it hold up with no flats on pretty rough New England roads. Prior to this wheelset I have always used tubulars and tubeless. This makes me want to get back on the tubeless wheels for fall and winter.


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PostPosted: Mon Sep 10, 2012 8:02 pm 
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Location: Bay Area, CA
Yea im glad to not have gone down. I'm really hoping zipp will give me some deal to repair/ replace the rim.


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PostPosted: Mon Sep 10, 2012 8:11 pm 
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Joined: Sat Jun 13, 2009 4:02 am
Posts: 1969
Location: NoVA/DC
"it is probably the crappy zipp hubs."
-zen

:grin::grin:


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PostPosted: Mon Sep 10, 2012 8:15 pm 
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Joined: Mon Mar 19, 2012 3:31 pm
Posts: 459
That's a pretty cheap shot dude. It's the most, or amongst the most, revered tyres out there, I run 'em too, so it's definately a bodge job at the heating press.


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PostPosted: Mon Sep 10, 2012 8:17 pm 
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Joined: Tue May 23, 2006 4:33 am
Posts: 736
You show photos from both sides of the blowout and, as I would be, seem more focused on the damage done to the wheels. Rightly so.

However, here are my two cents' worth. It looks to me like you had a brake block that slightly chafed one side of that tire right above the braking surface, until it wore through a level or two of cords. At that point it started to separate, the tire emerged, and you had your failure. Different rims need brake block height adjusted slightly, and I think that's what happened here. It's not common for a sidewall to "unzip" like that for a long distance without having another contributor to the problem. That area is where the casing wraps around the bead and back up again, so it's actually pretty damned strong and the casing doesn't show delamination that could have initiated the problem on its own. The casing is still bonded to the bead.

I'm perplexed that you could have had an inner tube at 100+ psi come so far out of the tire, wrap around the frame, etc. and not have blown long before. If you separated the casing at the chafing line, a good size amount of tube could have extruded through the cut and actually reached the brakes/seatstays/chainstays and caused it to jam, though the tube wouldn't have lasted long like that. Note that you have chafe marks all over the side of the tire at the point where you ground your rim. This suggests that the tire had already collapsed at the point when you were grinding the rim -- i.e., a flat or blowout had already occurred.

Tire casing failures due to manufacturing defects are not that common these days. Usually if you look hard you find some other reason, such as an unidentified deflation, a tire cut, a brake block rubbing the tire casing, etc. It seems that you had something like that happen here. I don't think I'd blame Conti based on the photos you show.


Last edited by 11.4 on Mon Sep 10, 2012 8:22 pm, edited 1 time in total.

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PostPosted: Mon Sep 10, 2012 8:21 pm 
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Location: Wherever there's a mountain beckoning to be climbed
Very impressed that the 72g <Performance Bike> Forte inner lightweight tube did not "flat" given all the drama it experienced.


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PostPosted: Mon Sep 10, 2012 8:25 pm 
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Joined: Tue Apr 07, 2009 10:03 pm
Posts: 15
Location: UK
I had similar issue!

Riding down mont ventoux at approx 35-40mph, rear tyre blew out instantly (wasn't braking or cornering), lost control and crashed hard. Didn't break any bones but in a bad way and had to be driven off the mountain :(

As you can see from the pics the tyre and tube were wrecked. Hard to tell how it went due to amount of damage but suspect sidewall blew out. Tyre was approx 150 miles old. HAd done a couple of fast descents on it previously without issue. Used latex tubes for 10 years - always very careful not to pinch and have never had an issue with them.

Video here, sound out of sync though http://www.youtube.com/watch?v=mo5sk91-eTo

Image


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PostPosted: Mon Sep 10, 2012 8:49 pm 
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Location: Bay Area, CA
11.4 - brake block as in my pads were on the tires? those would have blown long before from some long descents. I can take more pictures of the brake track, zipps have a pretty large area. The wear on the sidewall is from the tire sliding around the rim.


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Posted: Mon Sep 10, 2012 8:49 pm 


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PostPosted: Mon Sep 10, 2012 9:02 pm 
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Joined: Tue Jan 13, 2009 2:35 am
Posts: 445
I've seen that same thing happen to a mountain bike before. But the tire was not so new.


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