Pneumatic tire with tread having crown circumferential grooves and middle circumferential grooves

A pneumatic tire including comprising

• a tread portion provided with a pair of crown circumferential grooves extending continuously in a circumferential direction of the tire and disposed one on each side of the tire equator and
• each said crown circumferential groove having two groove edges, wherein
• one of said two groove edges extends in such a zigzag form that L-shaped groove edge segments are connected in succession in the circumferential direction of the tire, and
• the other groove edge extends in such a wavy form that circular arc groove edge segments each having a circular arc shape convex toward a groove center line are connected in succession in the circumferential direction of the tire, wherein
• each of said L-shaped groove edge segments comprises
• a long part inclined at an angle of 1 to 20° with respect to the circumferential direction, and
• a short part having a circumferential length smaller than that of said long part and inclined in the opposite direction to said long part with respect to the circumferential direction,
• wherein
• the tread portion is further provided with
• a middle circumferential groove disposed axially outside each said crown circumferential groove,
• the middle circumferential groove extending continuously in the circumferential direction and having an axially inner edge extending straight in the circumferential direction, and an axially outer edge extending zigzag in the circumferential direction,
• a crown land portion extending continuously in the circumferential direction and define between said a pair of the crown circumferential grooves,
• a pair of middle land portions each defined between said middle circumferential groove and the adjacent crown circumferential groove, and
• a pair of shoulder land portions each defined between said middle circumferential groove and the adjacent ground contact edge of the tread portion.