Inner tube

An inner tube is an inflatable torus that forms the interior of some pneumatic tires.

[1] The tube is inflated through a valve stem and fits inside the tire casing.

Inner tubes were invented in the 1800s for use with pneumatic tires, as standard wheels at the time were not air-filled, making them uncomfortable to ride on.

Over the years, inner tubes were manufactured in various colors beyond the typical black, including red, white, and gray.

Some manufacturers have also developed other types of bike inner tubes, such as those made from latex and TPU.