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PostPosted: Wed Feb 18, 2015 10:24 pm 
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This is what happens when you use a valve stem that can move up into the rim when the tube is deflated. My tube exploded on a ride and I rolled over the valve stem which jammed it through the side of the rim.

Don't be stupid. Don't be like me. :o

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PostPosted: Wed Feb 18, 2015 10:52 pm 
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Ouch, that sucks! Can you provide more details of what happened? What wheels are those?

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Posted: Wed Feb 18, 2015 10:52 pm 


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PostPosted: Wed Feb 18, 2015 11:03 pm 
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Sure, Gabe. These are 25mmx35mm Light Bicycle rims on Dura Ace hubs. U shape. Zipp rim tape.

The tube was a Michelin latex tube. I had about 200 miles on it. It exploded for unknown reasons, 180 degrees opposite of the valve stem, blowing the tire off the rim. There is a 12" tear in the tube. Rim temperature was ambient, about 55F.


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PostPosted: Thu Feb 19, 2015 12:05 am 
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Yikes. What are the odd of that happening? I have had a nail jam into the inner track of a Mavic rim before. That made me really grateful for double-walled rims.


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PostPosted: Thu Feb 19, 2015 1:28 am 
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Location: Santa Cruz, California, USA
Wow, I have not seen that happen before. Maybe there is a use for those stem nuts I always throw away after all.

How short was the valve stem?


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PostPosted: Thu Feb 19, 2015 1:43 am 
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Ouch! Sorry for your mishap. Can't say for sure obviously, but certainly sounds like upon installation there may have been some of the latex just caught slightly under the bead. 200 miles was enough time for it to creep in there even more and then tear and kaboom. Butyl is less likley to be able to do that since it's thicker and less pliable. If you do happen to pinch enough butyl for this to even occur it'll usually happen as you're pumping it up right after installation, or very shortly after. Probably the main reason clinchers and latex tubes are sometimes not the best combo.

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PostPosted: Thu Feb 19, 2015 4:36 am 
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eric, the valve stem had just enough protruding to attach a pump.

Calnago, I agree that it must have worked its way under the bead. I check my latex tubes thoroughly during installation to make sure they are not pinched. At any rate, I'm going back to butyl. If this had happened at a different point in the ride or had the front tire blown, it could have resulted in a nasty accident.

I'm going to order some 12K T700 and epoxy for the repair.


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PostPosted: Thu Feb 19, 2015 9:40 pm 
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Location: United Kingdom of Great Britain and Northern Ireland
F45 wrote:
eric, the valve stem had just enough protruding to attach a pump.


Even the pro teams do it like that sometimes. They use those Lezyne screw-on valve heads which I have never rated.


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PostPosted: Thu Mar 05, 2015 11:36 pm 
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Location: The land of Oz
Geez, glad it didn't end any worse than it did, could have been an ugly incident. I run my Zipps like that but they are tubs so i hope that makes mine immune??? to the situation. Please post an image of your repair, very interested to see how it comes out.

Steve

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Posted: Thu Mar 05, 2015 11:36 pm 


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PostPosted: Thu Mar 05, 2015 11:43 pm 
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Yikes! That is a bummer.....post pics of the fix.

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