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Inner Tube, displaced air.

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Inner Tube, displaced air.

Old 11-04-11, 05:10 AM
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rickyhmltn
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Inner Tube, displaced air.

So yesterday while I was pumping up an inner tube it split and rang out like a shot gun. So I got one to replace it. I blew it up but it had large pockets of air in different places around the inner tube. Basically it wasn't even and it wouldn't really sit in the rim correctly. The size was correct. Is this just a dud inner tube?
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Old 11-04-11, 06:33 AM
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prathmann
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You're ascribing problems to the tube that are likely to be with the tire. When you get a loud bang and long split in an inner tube that's an indication that the tire came off the rim and allowed the inner tube to escape and consequently blow up. Frequently the tire will reseat itself after the tube deflates. It's not entirely clear what you're describing as happening with the new tube. Make sure the tire bead is evenly seated in the edge of the rim and that the tube isn't pinched between the tire bead and rim at any point. Partially inflate the tube and check the tire bead position again, correcting as necessary as you increase the pressure. If the tire bead keeps popping out of position then you may have a defective tire. Another possibility is that you have an older style 'non-hooked' rim with smooth sides instead of having a little hook at the extreme outer edge - these weren't meant to take as much pressure as is used with current narrow tires.
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Old 11-04-11, 06:43 AM
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Originally Posted by rickyhmltn View Post
So yesterday while I was pumping up an inner tube it split and rang out like a shot gun. So I got one to replace it. I blew it up but it had large pockets of air in different places around the inner tube. Basically it wasn't even and it wouldn't really sit in the rim correctly. The size was correct. Is this just a dud inner tube?
That happens when the tube is pinched between the tire bead and the wheel rim.
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Old 11-04-11, 08:59 AM
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Some tubes are duds. More often, the installation job was a dud.
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Old 11-04-11, 09:51 PM
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MudPie
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Originally Posted by rickyhmltn View Post
So yesterday while I was pumping up an inner tube it split and rang out like a shot gun. So I got one to replace it. I blew it up but it had large pockets of air in different places around the inner tube. Basically it wasn't even and it wouldn't really sit in the rim correctly. The size was correct. Is this just a dud inner tube?
Did you just pump up the innertube with no tire on it?

The second instance seems like you had no tire and as you pumped up the tube you saw an inner tube with various bulges. Yes, I've seen that too and I am sure it is normal since the wall thickness of the tube is probably not equal. Usually the tire restricts and contains the shape of the inner tube so the tube conforms to the shape of the tire. Thus when the tube is contained in the tire and you pump it up, the tube will not fail unless the tire rips, the bead fails, or an exposed sharp edge like a spoke pops it.
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