inner tube

English Thesaurus

1. an inflatable rubber tube that fits inside the casing of a pneumatic tire (noun.artifact)

hypernym	:	tube, tubing,
definition	:	conduit consisting of a long hollow object (usually cylindrical) used to hold and conduct objects or liquids or gases (noun.artifact)

part meronym	:	pneumatic tire, pneumatic tyre,
definition	:	a tire made of reinforced rubber and filled with compressed air; used on motor vehicles and bicycles etc (noun.artifact)