inner tube

noun

1. a doughnut-shaped, flexible rubber tube inflated inside a tire to bear the weight of a vehicle.

inner tube

noun

1. an inflatable rubber tube that fits inside a pneumatic tyre casing

Word History and Origins

Origin of inner tube¹

First recorded in 1890–95

Example Sentences

On our last day together in Greece, we took the adventure wheelchair and swapped out the back bike tires for enormous inflated inner tubes almost the size of small car tires.

From Outside Online

Après-ski dance parties in crowded bars may not be a great idea this winter, but you can still boogie under disco lights—on an inner tube.

From Outside Online

The inner tube has an internal flanch, to which a flat circular plate is screwed to close up the tube.

From Project Gutenberg

The inner tube is of the same diameter as the flue, and forms a continuation of it.

From Project Gutenberg

The tubes constituting the condenser and inner tube of the air-vessel may in all cases be 1/8th of an inch thick.

From Project Gutenberg

If the tyres are allowed to go flat, the weight of the machine will be likely to "nip" the inner tube.

From Project Gutenberg

Care must be taken when joining on the side piece that the inner tube is not heated enough to fuse it.

From Project Gutenberg