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-   -   Inner Tube Explosion!!! (https://www.bikeforums.net/road-cycling/238950-inner-tube-explosion.html)

Electric_Elvis 10-21-06 10:36 PM

Inner Tube Explosion!!!
 
So I pumped up my tire to 100 psi using my 2 week old Blackburn TP-1 floor pump. About 10 minutes later I hear this loud pop, almost like a gunshot. I look at my bike and the front tire is completly flat. When I took the tube off it had a hole in it the size of a pin head. The tube is a michelin air comp ultra light that I got from PBK about two months ago, and has been on the bike since then with zero problems.

When I pump the tires up I start to get major resistancce at 80 psi, the past few times I usually stopped and left it at that point, but today I forced it up to 100. Did I do something wrong? Could there be a problem with either the pump or tube?

Dubbayoo 10-21-06 10:43 PM

That happens to me sometimes. When you start to feel the reistance, stop and wiggle the pump head connection to the tire's valve stem and you may see the pressure drop about 30 psi. Once you do start pumping again.

CAAD5AL 10-21-06 10:47 PM

That's usually a sure sign you've either got the bead of the tire sitting on the tube, or riding up on the rim a bit so that the tube can stick out. If you haven't moved the tire at all since you first installed it, though, that's probably not too likely. Assuming your tire is rated for that pressure, take a look for for exposed spoke heads, something in your tire, etc. Also, make sure your pressure gauge is accurate - maybe you were over 100 all along!

Electric_Elvis 10-21-06 10:58 PM


Originally Posted by CAAD5AL
That's usually a sure sign you've either got the bead of the tire sitting on the tube, or riding up on the rim a bit so that the tube can stick out. If you haven't moved the tire at all since you first installed it, though, that's probably not too likely. Assuming your tire is rated for that pressure, take a look for for exposed spoke heads, something in your tire, etc. Also, make sure your pressure gauge is accurate - maybe you were over 100 all along!

I was thinking that maybe it was the pressure guage. The guage always starts at zero when I connect it to the valve even when I am just adding some air to a mostly filled tire. Should I deflate the tire first, then reinflate it? Is there some kind of secret to presta valves?

Geoff326 10-22-06 03:46 AM

it takes a couple pumps for the guage to read the psi accurately

have u tried any other pumps?

Dead Roman 10-22-06 04:12 AM

funny you should mention that.I had the same thing happen to me tonight. Though, i pump my tires to 120

Electric_Elvis 10-22-06 08:45 AM

Hhhhmmmm, check this out on sheldonbrown.com, sounds like this could have been the problem.

http://www.sheldonbrown.com/brandt/tube-failure.html

merlinextraligh 10-22-06 11:11 AM

either the tube wasn't seated against the rim, a spoke is coming up through the base tape, a very small piece of glass (or something elses) was just protruding through the tread, or there was defect in the tube that finally let go.

even if the gauge was off a 100%, its impossible to make a non defective tube fail by pumping it up too much with a hand pump.

At some point, you could blow a clincher tire off the rim with emough pressure, but I doubt anyone is strong enough to do that with nodefective tires properly seated

And if overinfalting was your cause, when you blew it off the rim, the failure would be quite noticeable.


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