A tyre comprising: a tread portion, wherein the tread portion comprises a first tread edge, a second tread edge, four circumferential grooves extending continuously in a tyre circumferential direction between the first tread edge and the second tread edge, and five land portions divided by the four circumferential grooves, the five land portions comprise a first middle land portion located between the first tread edge and a tyre equator and a second middle land portion located between the second tread edge and the tyre equator, the first middle land portion comprises a first longitudinal edge extending in the tyre circumferential direction on a first tread edge side, a second longitudinal edge extending in the tyre circumferential direction on a second tread edge side, and a ground contact surface between the first longitudinal edge and the second longitudinal edge, the first middle land portion is provided with a plurality of first middle sipes inclined at an angle (θ2) with respect to a tyre axial direction and fully traversing the first middle land portion in the tyre axial direction, each of the plurality of first middle sipes comprises a pair of sipe edges, at least one of the pair of sipe edges opens at the ground contact surface via a chamfer portion over an entire length thereof, and the chamfer portion has a chamfer width increasing from the first longitudinal edge to the second longitudinal edge continuously, the second middle land portion comprises a first longitudinal edge extending in the tyre circumferential direction on the first tread edge side, a second longitudinal edge extending in the tyre circumferential direction on the second tread edge side, and a ground contact surface between the first longitudinal edge and the second longitudinal edge, characterised in that the second middle land portion is provided with a plurality of second middle sipes inclined at an angle (θ5) with respect to the tyre axial direction and fully traversing the second middle land portion in the tyre axial direction, each of the plurality of second middle sipes comprises a pair of sipe edges, at least one of the pair of sipe edges opens at the ground contact surface of the second middle land portion via a chamfer portion over an entire length thereof, and the chamfer portion of each second middle sipe has a chamfer width increasing from the second longitudinal edge to the first longitudinal edge continuously. a tread portion, wherein the tread portion comprises a first tread edge, a second tread edge, four circumferential grooves extending continuously in a tyre circumferential direction between the first tread edge and the second tread edge, and five land portions divided by the four circumferential grooves, the five land portions comprise a first middle land portion located between the first tread edge and a tyre equator and a second middle land portion located between the second tread edge and the tyre equator, the first middle land portion comprises a first longitudinal edge extending in the tyre circumferential direction on a first tread edge side, a second longitudinal edge extending in the tyre circumferential direction on a second tread edge side, and a ground contact surface between the first longitudinal edge and the second longitudinal edge, the first middle land portion is provided with a plurality of first middle sipes inclined at an angle (θ2) with respect to a tyre axial direction and fully traversing the first middle land portion in the tyre axial direction, each of the plurality of first middle sipes comprises a pair of sipe edges, at least one of the pair of sipe edges opens at the ground contact surface via a chamfer portion over an entire length thereof, and the chamfer portion has a chamfer width increasing from the first longitudinal edge to the second longitudinal edge continuously, the second middle land portion comprises a first longitudinal edge extending in the tyre circumferential direction on the first tread edge side, a second longitudinal edge extending in the tyre circumferential direction on the second tread edge side, and a ground contact surface between the first longitudinal edge and the second longitudinal edge, characterised in that the second middle land portion is provided with a plurality of second middle sipes inclined at an angle (θ5) with respect to the tyre axial direction and fully traversing the second middle land portion in the tyre axial direction, each of the plurality of second middle sipes comprises a pair of sipe edges, at least one of the pair of sipe edges opens at the ground contact surface of the second middle land portion via a chamfer portion over an entire length thereof, and the chamfer portion of each second middle sipe has a chamfer width increasing from the second longitudinal edge to the first longitudinal edge continuously.