Abstract: A pneumatic tire includes an inflatable tire tube having a plurality of inflatable cell units arranged in an annular formation. A check valve is provided in a cell inlet opening of each cell unit. A control chamber is disposed adjacent to each cell unit and includes a diaphragm member provided therein so as to partition the control chamber into first and second fluid compartments. The first and second fluid compartments of the control chambers are respectively connected to and communicated with those of adjacent control chambers. Each check valve has a first portion extending into one of the cell units and a second portion extending into the first fluid compartment of one of the control chambers. A first tire valve is provided to charge air into and to release air from the second fluid compartment of each of the control chambers so as to move the respective diaphragm member to correspondingly open and close the check valves.