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WTF is up with this tube?

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WTF is up with this tube?

Old 02-08-15, 02:06 PM
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DOS
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WTF is up with this tube?

I got a flat, small puncture, no big deal. Patched it like I have done many times. Inflated to check that the patch had sealed (it had) but tube looks like a snake that just swallowed a rat.
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Old 02-08-15, 02:12 PM
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Cheap tubes with inconsistent thickness will do that. The tire will keep any one section from stretching too far, so I don't worry about it.
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Old 02-08-15, 02:13 PM
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Tube is toast, thin spot looks like. Toss and try again?
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Old 02-08-15, 02:14 PM
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Ever blow up a long balloon? After the pressure takes up the slack, and the tube begins to stretch, that area is under greater "hoop stress" by virtue of the larger diameter. Depending on the elastic proprties of the balloon or tube, the local diameter will continue to increase until there's enough resistance, then the rest of the tube will come to that or a similar diameter in sections.

Not all tubes will fill this way, and some will stay pretty uniform as inflated (outside of the tire), but the smallest variation in wall thickness or strength will cause this effect.

In any case, it doesn't matter, since the tube is only an air bladder, and will always fill the space available within the tire which determines it's shape.
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Old 02-08-15, 02:23 PM
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I've had a number of tubes that showed that kind of unevenness of rubber thickness. They all worked fine when inside a tire.
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Old 02-08-15, 02:32 PM
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Originally Posted by FBinNY View Post
Ever blow up a long balloon? After the pressure takes up the slack, and the tube begins to stretch, that area is under greater "hoop stress" by virtue of the larger diameter. Depending on the elastic proprties of the balloon or tube, the local diameter will continue to increase until there's enough resistance, then the rest of the tube will come to that or a similar diameter in sections.

Not all tubes will fill this way, and some will stay pretty uniform as inflated (outside of the tire), but the smallest variation in wall thickness or strength will cause this effect.

In any case, it doesn't matter, since the tube is only an air bladder, and will always fill the space available within the tire which determines it's shape.

This, and ThermionicScott post, is more or less the theory I decided to go with when I went ahead and mounted the tire just after I posted. I had of course noted before that tubes don't always inflate evenly, and usually develop some bulging around patches, when outside tires, but this seemed extreme. I inflated the tire to 100psi (slowly, just in case the theory about things evening out inside tire was wrong) and all seems well ( no explosions or tire bulges). I'll report back if the tire explodes at some point in next few hours.
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Old 02-08-15, 02:33 PM
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Cut it open and make sure something didn't crawl inside before you patched it.
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Old 02-08-15, 02:36 PM
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I've never had a tube that did NOT do this. There is nothing wrong. Just use it.
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Old 02-08-15, 07:03 PM
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Inner tube ingests rat. Call National Inquirerer at once.
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Old 02-08-15, 07:35 PM
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Old 02-08-15, 09:33 PM
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I think that means your patch is adequate.
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Old 02-09-15, 11:42 AM
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This is pretty much normal for an inflated tube outside the tire carcass. Once the tube is inside the tire, the tube shape will conform to the tire dimensions and grow no larger, just more PSI. I've seen this condition on both cheap and more expensive tubes. They all worked fine after repairs were made.
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Old 02-09-15, 11:46 AM
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Originally Posted by 1 Miyata Biker View Post
This is pretty much normal for an inflated tube outside the tire carcass..
Do you have good luck with road kill tires?
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