Tire

A tire, comprising:

• a plurality of main grooves extending in a tire circumferential direction;
• a land portion defined by the main grooves;
• a plurality of lug grooves extending through the land portion;
• and a plurality of blocks defined by the plurality of main grooves and the plurality of lug grooves, the main grooves comprising, in a meridian cross-section, a bend point where an angle of a groove wall with respect to a normal line of a tread surface changes, the bend point not including a transition from a groove bottom of the main grooves to the groove wall of the main grooves and the bend point being provided radially outward of the groove bottom of the main grooves, the plurality of blocks comprising a first block and a second block, where among a first main groove and a second main groove having distances differing from each other in a tire width direction from a tire equatorial plane, the first block has a first edge along the first main groove where a distance in the tire width direction is closer to the tire equatorial plane and the second block has a second edge along the second main groove where a distance in the tire width direction is farther from the tire equatorial plane, two angles between an imaginary line obtained by extending a ridge line formed by the bend point of a groove wall on the first edge side of the first main groove and imaginary lines each obtained by extending two edges that are adjacent to each other in the tire circumferential direction with the first edge interposed therebetween among edges of a road contact surface of the first block being an acute angle θa and an obtuse angle θb, two angles between an imaginary line obtained by extending a ridge line formed by the bend point of a groove wall on the second edge side of the second main groove and imaginary lines each obtained by extending two edges that are adjacent to each other in the tire circumferential direction with the second edge interposed therebetween among edges of a road contact surface of the second block being an acute angle θc and an obtuse angle θd, a difference between the acute angle θa and the obtuse angle θb being greater than a difference between the acute angle θc and the obtuse angle θd, and a difference of angles between groove walls on both sides of the first main groove with respect to the normal line of the tread surface in a meridian cross-section of the first main groove at positions of two points where intersection points of the imaginary lines obtained by extending each of the two edges that are adjacent to each other in the tire circumferential direction with the first edge interposed therebetween and a groove center line of the first main groove are moved along the groove center line by a predetermined distance in a direction approaching each other being greater than a difference of angles between groove walls on both sides of the second main groove with respect to the normal line of the tread surface in a meridian cross-section of the second main groove at positions of two points where intersection points of the imaginary lines obtained by extending each of the two edges that are adjacent to each other in the tire circumferential direction with the second edge interposed therebetween and a groove center line of the second main groove are moved along the groove center line by a predetermined distance in a direction approaching each other;
• wherein the difference of the angles between the groove walls on both sides of the first main groove with respect to the normal line of the tread surface in the meridian cross-section of the first main groove is 1 degree or more and 15 degrees or less, one of the groove walls of the first main groove inclining toward a first side in the tire width direction and another one of the groove walls of the first main groove inclining toward a second side in the tire width direction opposite the first side, the difference of the angles between the groove walls on both sides of the second main groove with respect to the normal line of the tread surface in the meridian cross-section of the second main groove is 1 degree or more and 15 degrees or less, one of the groove walls of the second main groove inclining toward the first side in the tire width direction and another one of the groove walls of the second main groove inclining toward the second side in the tire width direction opposite the first side, the first block is disposed on the tire equatorial plane, the second block is on a first side of the first block in the tire width direction and a third block having an identical shape to the second block is on a second, opposite side of the first block in the tire width direction, both of edges of the first block in the tire width direction have a bent shape that projects to an inner side of the block in a plan view, and both of edges of the second block in the tire width direction have a bent shape that projects to an inner side of the block in a plan view the groove center line of the first main groove and the groove center line of the second main groove in a tread plan view each have a zigzag shape with an amplitude in the tire width direction, the zigzag shape of the groove center line of the first main groove is formed by repeating connections between a plurality of linear portions, the zigzag shape of the groove center line of the second main groove is formed by repeating connections between a long portion and a short portion having mutually different lengths in the tire circumferential direction, and the long portion of the zigzag shape of the groove center line of the second main groove overlaps, in the tire width direction, all other long portions of the second main groove along the tire circumferential direction, wherein all of the short portions intersect any one of the lug grooves and all of the long portions do not intersect any one of the lug grooves.