Inner tube
Part of a tire / From Wikipedia, the free encyclopedia
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This article is about the tire component. For the flotation device, see Swim ring.
An inner tube is an inflatable torus that forms the interior of some pneumatic tires.[1] The tube is inflated with a valve stem, and fits inside of the casing of the tire. The inflated inner tube provides structural support and suspension, while the outer tire provides grip and protects the more fragile tube.