Innertube fat on one side, skinny on the other 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.
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.