A tire, comprising: a tread having a pair of crown main grooves continuously extending in a tire circumferential direction such that the pair of crown main grooves is formed on both outer sides of a tire equator, respectively, and a pair of shoulder main grooves continuously extending in the tire circumferential direction on tire axial direction outer sides of the crown main grooves, respectively, wherein each of the pair of crown main grooves has a plurality of crown long side portions inclined to one side in an inclination direction with respect to the tire circumferential direction and a plurality of crown short side portions inclined in an opposite direction with respect to the inclination direction of the crown long side portions such that each crown short side portion has a length which is shorter than a length of each crown long side portion and that the crown long side portions and short side portions are alternately formed in a zigzag shape extending in the tire circumferential direction, characterised in that the pair of shoulder main grooves has a plurality of shoulder long side portions inclined to one side in an inclination direction with respect to the tire circumferential direction and a plurality of shoulder short side portions inclined in an opposite direction with respect to the inclination of the shoulder long side portions such that each shoulder short side portion has a length which is shorter than a length of each shoulder long side portion and that the shoulder long side portions and short side portions are alternately formed in a zigzag shape extending in the tire circumferential direction, and, the crown main grooves and shoulder main grooves are formed such that a crown long-short ratio La/Lb is larger than a shoulder long-short ratio Lc/Ld, where La is a length of each crown long side portion, Lb is a length of each crown short side portion, Lc is a length of each shoulder long side portion, and Ld is a length of each shoulder short side portion. a tread having a pair of crown main grooves continuously extending in a tire circumferential direction such that the pair of crown main grooves is formed on both outer sides of a tire equator, respectively, and a pair of shoulder main grooves continuously extending in the tire circumferential direction on tire axial direction outer sides of the crown main grooves, respectively, wherein each of the pair of crown main grooves has a plurality of crown long side portions inclined to one side in an inclination direction with respect to the tire circumferential direction and a plurality of crown short side portions inclined in an opposite direction with respect to the inclination direction of the crown long side portions such that each crown short side portion has a length which is shorter than a length of each crown long side portion and that the crown long side portions and short side portions are alternately formed in a zigzag shape extending in the tire circumferential direction, characterised in that the pair of shoulder main grooves has a plurality of shoulder long side portions inclined to one side in an inclination direction with respect to the tire circumferential direction and a plurality of shoulder short side portions inclined in an opposite direction with respect to the inclination of the shoulder long side portions such that each shoulder short side portion has a length which is shorter than a length of each shoulder long side portion and that the shoulder long side portions and short side portions are alternately formed in a zigzag shape extending in the tire circumferential direction, and, the crown main grooves and shoulder main grooves are formed such that a crown long-short ratio La/Lb is larger than a shoulder long-short ratio Lc/Ld, where La is a length of each crown long side portion, Lb is a length of each crown short side portion, Lc is a length of each shoulder long side portion, and Ld is a length of each shoulder short side portion.