Heavy duty tire

A heavy duty tire comprising:

• a tread portion,
• wherein the tread portion includes:
• a plurality of circumferential grooves zigzagging in a tire circumferential direction so as to form zigzag vertexes,
• a plurality of lateral grooves connecting between the zigzag vertexes of the circumferential grooves adjacent to each other in a tire axial direction, and
• a plurality of hexagonal blocks formed by the circumferential grooves adjacent to each other in the tire axial direction and the plurality of lateral grooves,
• wherein the plurality of circumferential grooves each have a groove depth of 21 mm or more,
• wherein each of the plurality of hexagonal blocks comprises a three-dimensional sipe zigzagging in the tire axial direction and a tire radial direction and extending across the corresponding hexagonal block,
• wherein each of the plurality of lateral grooves comprises a raised portion formed by raising a groove bottom of the corresponding lateral groove to connect between the hexagonal blocks adjacent to each other in the tire circumferential direction,
• wherein, in each of the plurality of lateral grooves, a length of the raised portion in the tire axial direction is less than a length of the lateral groove in the tire axial direction,
• wherein, in each of the plurality of lateral grooves, the length of the raised portion in the tire axial direction is 0.4 to 0.6 times the length of the lateral groove in the tire axial direction,
• wherein, in each of the plurality of lateral grooves, a groove depth at the raised portion is 0.5 to 0.8 times a groove depth of each circumferential groove to which the lateral groove is connected,
• wherein a depth of each three-dimensional sipe is 0.5 to 0.8 times a groove depth of each circumferential groove to which the three-dimensional sipe is connected,
• wherein each of the plurality of lateral grooves comprises a pair of groove walls, and a pair of groove edges located at positions at which the pair of groove walls and a tread surface of the hexagonal blocks intersect each other,
• wherein each of the pair of groove walls is inclined at an angle from 3° to 8° relative to a normal line passing through a corresponding one of the pair of groove edges so as to be normal to the tread surface,
• wherein each of the plurality of lateral grooves has a groove width of 7 to 9 mm,
• wherein the plurality of circumferential grooves comprises a pair of crown circumferential grooves, and a pair of shoulder circumferential grooves disposed outwardly of the pair of crown circumferential grooves in the tire axial direction,
• wherein the plurality of lateral grooves comprises a plurality of crown lateral grooves connecting between the pair of crown circumferential grooves, and a plurality of middle lateral grooves each connecting between the crown circumferential groove and the shoulder circumferential groove which are adjacent to each other in the tire axial direction,
• wherein the raised portion comprises a crown raised portion and a middle raised portion formed in each crown lateral groove and each middle lateral groove, respectively,
• wherein a groove depth at the crown raised portion is equal to a groove depth at the middle raised portion,
• wherein the hexagonal blocks comprise a plurality of crown blocks formed between the pair of crown circumferential grooves, and a plurality of middle blocks formed between the crown circumferential groove and the shoulder circumferential groove which are adjacent to each other in the tire axial direction,
• wherein the three-dimensional sipes comprise a crown sipe disposed in each of the plurality of crown blocks, and a middle sipe disposed in each of the plurality of middle blocks,
• wherein a maximum depth of the middle sipe is greater than a maximum depth of the crown sipe,
• wherein a first difference between the maximum depth of the crown sipe and the groove depth of the crown raised portion is less than a second difference between the maximum depth of the middle sipe and the groove depth of the middle raised portion, and
• wherein the first difference between the maximum depth of the crown sipe and the groove depth of the crown raised portion is 0.3 to 0.4 times the second difference between the maximum depth of the middle sipe and the groove depth of the middle raised portion.