Pneumatic radial tire

A pneumatic radial tire having a tread surface divided into a first half portion and a second half portion across a tire equator as a boundary, the first half portion having a first circumferential main groove extending in the tread circumferential direction, the second half portion having two circumferential main grooves including a second circumferential main groove and a third circumferential main groove both extending in the tread circumferential direction,

• wherein the first circumferential main groove in the first half portion has a groove wall on the tread width direction outside which is inclined relative to the tire radial direction at a larger inclination angle as compared to an inclination angle relative to the tire radial direction of a groove wall on the tread width direction inside,
• wherein, the second circumferential main groove in the second half portion lies inside in the tread width direction and the third circumferential main groove in the second half portion lies outside in the tread width direction,
• wherein, of the two circumferential main grooves in the second half portion, the second circumferential main groove has a groove wall on the tread width direction outside which is inclined relative to the tire radial direction at a larger inclination angle as compared to an inclination angle relative to the tire radial direction of a groove wall on the tread width direction inside,
• wherein, of the two circumferential main grooves in the second half portion, the third circumferential main groove has a groove wall on the tread width direction inside which is inclined at a larger inclination angle relative to the tire radial direction as compared to an inclination angle relative to the tire radial direction of a groove wall on the tread width direction outside.