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Is this normal for an inner tube?

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Is this normal for an inner tube?

Old 06-28-08, 05:21 AM
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miffyelmo
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Is this normal for an inner tube?

Hi everyone,

I recently went to a bike shop to purchase a new inner tube for my bike as my current one has around 5 patches on it and has a slow puncture that I can't locate. Now the shop I went to isn't the most reputable, but it's the only one I have within walking distance.

Anyway, I bought an inner tube (the only kind they had), got home, and started to pump it up to see if it was okay. When I pumped it up however, it went into a really odd shape. I know if it was within the tyre, it would likely be constrained, but I can't help but feel something isn't right. I only pumped it up a little bit, as I was afraid of what might happen if I carried on! By a little, I mean three or four pumps of a largish bicycle pump.

So really, what I want to know is whether it's normal for an inner tube to go like this, or whether I should take it back to the shop and order a decent branded one online. A picture of the tube is below:



Thanks very much for taking the time to read this post!
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Old 06-28-08, 05:30 AM
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AdrianFly
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Keep the tube inflated the way it is right now and go back to your LBS. You need to have the tube True'd.
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Old 06-28-08, 05:45 AM
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Don't pump up a tube like that before you put it in the tire. Pump it just a touch in order to seat it, that's all. Put this tube in, it will be fine.
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Old 06-28-08, 05:53 AM
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Ziemas
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They all do that, from cheap to expensive ones.
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Old 06-28-08, 06:34 AM
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Don't inflate tubes like that so much without it being in the tire - it's liable to blow. You don't need it that big even to search for a pucnture. And that shape is normal, without the tire to encase the tube it will go into grotesque shapes.
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Old 06-28-08, 07:45 AM
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Well that's good news! Thanks very much for the replies. I'll stick to pumping it up only when it's in the tyre from now on!
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Old 06-28-08, 07:55 AM
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They do that to varying extents. I don't know that it's the sign of a cheap or bad tube. It probably means that one part is thicker than the other by a tad. But if it was all as thin as the thinner part, that wouldn't be an improvement, either.
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Old 06-28-08, 09:05 AM
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The area around the valve is a little thicker and doesn't expand as easily as the rest of the tube.
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Old 06-28-08, 11:12 AM
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Originally Posted by miffyelmo View Post
Well that's good news! Thanks very much for the replies. I'll stick to pumping it up only when it's in the tyre from now on!
Pump it up a little before you put it in your tire or carry as a spare to see if it is defective.

You must have filled that too way to much for it to blow like that and still keep its shape.
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