A tyre comprising: a tread portion having a designated mounting direction to a vehicle, the tread portion comprising an outside tread edge located outwardly of a vehicle when being mounted to the vehicle, an inside tread edge located inwardly of a vehicle when being mounted to the vehicle, a plurality of circumferential grooves extending continuously in a tyre circumferential direction between the outside tread edge and the inside tread edge, and a plurality of lateral grooves extending in a direction intersecting the plurality of circumferential grooves, wherein the plurality of circumferential grooves comprises an outside shoulder circumferential groove, an outside crown circumferential groove, an inside crown circumferential groove and an inside shoulder circumferential groove which are arranged in this order from an outside tread edge side to an inside tread edge side, and a groove width W1 of the outside shoulder circumferential groove, a groove width W2 of the outside crown circumferential groove, a groove width W3 of the inside crown circumferential groove and a groove width W4 of the inside shoulder circumferential groove satisfy the following relation: W1 < W2 < W3 < W4, wherein the tread portion comprises an inside middle land portion defined between the inside shoulder circumferential groove and the inside crown circumferential groove, the plurality of lateral grooves comprises a plurality of inside middle lateral grooves extending from the inside shoulder circumferential groove to the inside crown circumferential groove, the tread portion comprises a crown land portion defined between the outside crown circumferential groove and the inside crown circumferential groove, and the plurality of lateral grooves comprises a plurality of crown lateral grooves extending from the inside crown circumferential groove and terminating within the crown land portion, characterized in that a sum of a total value of maximum groove widths W5 of the plurality of crown lateral grooves and a total value of maximum groove widths W6 of the inside middle lateral grooves is in a range of 30% to 40% of a circumferential length of the tread portion. a tread portion having a designated mounting direction to a vehicle, the tread portion comprising an outside tread edge located outwardly of a vehicle when being mounted to the vehicle, an inside tread edge located inwardly of a vehicle when being mounted to the vehicle, a plurality of circumferential grooves extending continuously in a tyre circumferential direction between the outside tread edge and the inside tread edge, and a plurality of lateral grooves extending in a direction intersecting the plurality of circumferential grooves, wherein the plurality of circumferential grooves comprises an outside shoulder circumferential groove, an outside crown circumferential groove, an inside crown circumferential groove and an inside shoulder circumferential groove which are arranged in this order from an outside tread edge side to an inside tread edge side, and a groove width W1 of the outside shoulder circumferential groove, a groove width W2 of the outside crown circumferential groove, a groove width W3 of the inside crown circumferential groove and a groove width W4 of the inside shoulder circumferential groove satisfy the following relation: W1 < W2 < W3 < W4, wherein the tread portion comprises an inside middle land portion defined between the inside shoulder circumferential groove and the inside crown circumferential groove, the plurality of lateral grooves comprises a plurality of inside middle lateral grooves extending from the inside shoulder circumferential groove to the inside crown circumferential groove, the tread portion comprises a crown land portion defined between the outside crown circumferential groove and the inside crown circumferential groove, and the plurality of lateral grooves comprises a plurality of crown lateral grooves extending from the inside crown circumferential groove and terminating within the crown land portion, characterized in that a sum of a total value of maximum groove widths W5 of the plurality of crown lateral grooves and a total value of maximum groove widths W6 of the inside middle lateral grooves is in a range of 30% to 40% of a circumferential length of the tread portion.