Pneumatic Run Flat Tire

A pneumatic run flat tire comprising a carcass layer mounted between a pair of left and right bead portions, a belt layer disposed on an outer circumferential side of the carcass layer in a tread portion, and an inner side reinforcing rubber layer having a falcated cross-section disposed on an inner side in a tire width direction of the carcass layer in a side wall portion;

• wherein
• an outer side reinforcing rubber layer is disposed on an outer side in the tire width direction of the carcass layer from the bead portion throughout the side wall portion, a center of gravity position in a meridian cross-section of the outer side reinforcing rubber layer is positioned inward in a tire radial direction of a position where tire width is greatest, volumes of the inner side reinforcing rubber layer and the outer side reinforcing rubber layer are each different on a vehicle inner side and a vehicle outer side when the pneumatic run flat tire is mounted on a vehicle, a ratio V1out/V1in of a volume V1out of the inner side reinforcing rubber layer on the vehicle outer side to a volume V1in of the inner side reinforcing rubber layer on the vehicle inner side is configured to be from 1.10 to 1.35, and a ratio V2in/V2out of a volume V2in, of the outer side reinforcing rubber layer on the vehicle inner side to a volume V2out of the outer side reinforcing rubber layer on the vehicle outer side is configured to be from 1.10 to 1.50.