An inner tube is an inflatable ring that forms the interior of some pneumatic tires. The tube is inflated with a valve, 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.
K219per tube
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Further information
The best way to check what size inner tube you need is to look on the sidewall of your tyre. Tyre manufacturers print the size on the sidewalls, so look out for numbers such as '700x23c' for a road bike, or '26x1. 75' which is for mountain bikes.
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