| 摘要 |
A pneumatic radial tire includes a pair of annular bead portions 2A, 2B, a tread portion 3 having a tread surface portion 3a, a pair of sidewall portions 4A, 4B each connecting one of both end portions in the tire-width directions of the tread portion 3 and an outward end in the tire-radial direction of the corresponding one of the bead portions, and a carcass layer 5 extending continuously across and through the bead portions, the sidewall portions, and the tread portion, the carcass layer being configured to form a framework of the tire. In a section taken in the tire-width directions, a first rubber gauge G1, G2 on a vehicle-fitted outer side is thicker than a first rubber gauge on a vehicle-fitted inner side, the first rubber gauge being defined as a thickness measured from a tire's external surface to the carcass layer and measured at each of the both tire-width-direction end portions of the tread portion, and a second rubber gauge G3, G4 on the vehicle-fitted outer side has a smaller thickness than a second rubber gauge on the vehicle-fitted inner side does, the second rubber gauge being defined as a thickness measured from the tire's external surface to the carcass layer in the tire-width direction and measured at each of both widest portions 4a, 4b of the sidewall portion, the widest portions being the portions protruding most externally in the tire-width directions.
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