Why was rubber rationed in World War 2?

Answer 1

The major sources of natural rubber were in areas of Asia either occupied by Japan or in areas close to the conflict (Indonesia, Malaya, Singapore). The sources in Africa required a long transport chain out of the continent and across the ocean. So synthetic rubber (neoprene) was produced to fill the great demand for wartime uses.

Answer 2

It was rationed for things such as tires for military tanks, and rubber was a much-needed necessity during World War 2.

Answer 3

The natural form of rubber used from rubber trees was depleted and an alternative material was necessary for continued use of ground vehicles.