I just bought a bicycle/bike tube (20"), when i inflate it, 1 side of it goes big/fat and the other just inflates normally, what should i do? , its happened with some of my other tubes.
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Overinflation - you normally need only 15-20 PSI to check if the tube is leaking. Too much more than that and you risk a blowout. Tubes can carry over 100psi when constrained by a tyre/rim, but on their own they act like balloons and keep stretching. – Criggie Jan 10 '16 at 19:00
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Sounds normal. When you inflate a tube to test it for leaks, parts will expand easily and other parts will hardly expand at all. When the tube is inside the tire this doesn't matter. (To insert the tube in the tire, only inflate it until it's mostly filled out but still limp.) – Daniel R Hicks Jan 10 '16 at 19:46
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You should mount the tire first and inflate second.
Tubes are not supposed to be inflated outside tires, they will behave like balloons but the material they are made of is not as stretchy.
ojs
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Minor correction: You should slightly inflate the tube before inserting in the tire -- just to the point where it's mostly "filled out" but still limp. – Daniel R Hicks Jan 10 '16 at 19:47
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1The Help Center has a good article on the thinking behind the way in which duplicates should be handled. – PeteH Jan 10 '16 at 20:35
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@Frisbee I noticed the duplicate after replying. I didn't think the reply was bad enough for removing, but apparently someone disagreed. – ojs Jan 12 '16 at 19:30
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@ojs I can vote it down to prove it is not me. I up voted the link a long time ago. – paparazzo Jan 12 '16 at 19:34