Pneumatic tire with tread having ground contact shape and uneven wear sacrificial protrusion

A pneumatic tire provided with a tread including a plurality of ribs separated by at least two circumferential direction grooves extending in a circumferential direction wherein:

• when looking at the tread ground contact shape under conditions that the pneumatic tire is mounted onto a rim with maximum loading, and with an air pressure corresponding to maximum loading, the ground contact shape has a gradually decreasing circumferential direction length from the tire width direction center to the portion corresponding towards the tire width direction outermost circumferential groove, followed by the ground contact shape having a gradually increasing circumferential direction length towards the tire width direction outside,
• and in the ground contact shape, the following relationships are satisfied:
• 0.02≦(A−B)/L≦0.1, and 0.02≦(C−B)/L≦0.1,
• wherein
• L is the circumferential direction length of the tire width direction center,
• A is the maximum length in the circumferential direction of the portion corresponding to the tire width direction outermost rib,
• Ws is the width of the portion corresponding to the tire width direction outermost rib,
• W2 is the width of the portion corresponding to the second rib from the outside in the tire width direction,
• B is the distance in the tire circumferential direction between two points that are intersections of border lines of circumferential direction sides of the portion corresponding to the outermost rib, intersecting with a first virtual line extending in the tire circumferential direction and at a distance of 0.076 Ws in the tire width direction to the outside from a border line of the portion corresponding to the outermost rib, the border line corresponding to an edge of a circumferential direction groove on the inside of the outermost rib in the tire width direction, and
• C is the distance in the tire circumferential direction between two points that are the intersections of border lines of circumferential direction sides of the portion corresponding to the second rib from the outside in the tire width direction, intersecting with a second virtual line that extends in the tire circumferential direction and is a distance of 0.112 W2 to the inside in the tire width direction from a border line corresponding to the tire width direction outside circumferential direction groove edge of the portion corresponding to the second rib from the outside in the tire width direction.