A tyre comprising: a tread portion comprising a first tread edge, a second tread edge, and a crown land portion arranged between the first tread edge and the second tread edge, wherein the crown land portion comprises a first longitudinal edge extending in a 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 crown land portion is provided with a plurality of first crown sipes and a plurality of second crown sipes, the first crown sipes and the second crown sipes open at the ground contact surface via chamfer portions, the first crown sipes extend from the first longitudinal edge and have closed ends in the ground contact surface, the second crown sipes extend from the second longitudinal edge and have closed ends in the ground contact surface, characterized in that the crown land portion is furthermore provided with a plurality of third crown sipes, wherein the third crown sipes open at the ground contact surface via chamfer portions, the third crown sipes extend from the first longitudinal edge and have closed ends in the ground contact surface, each of the first crown sipes has an opening width at the ground contact surface which is constant in a longitudinal direction of the sipe, each of the second crown sipes has an opening width at the ground contact surface which is constant in a longitudinal direction of the sipe, and each of the third crown sipes has an opening width which decreases continuously from the first longitudinal edge toward the closed end thereof. a tread portion comprising a first tread edge, a second tread edge, and a crown land portion arranged between the first tread edge and the second tread edge, wherein the crown land portion comprises a first longitudinal edge extending in a 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 crown land portion is provided with a plurality of first crown sipes and a plurality of second crown sipes, the first crown sipes and the second crown sipes open at the ground contact surface via chamfer portions, the first crown sipes extend from the first longitudinal edge and have closed ends in the ground contact surface, the second crown sipes extend from the second longitudinal edge and have closed ends in the ground contact surface, characterized in that the crown land portion is furthermore provided with a plurality of third crown sipes, wherein the third crown sipes open at the ground contact surface via chamfer portions, the third crown sipes extend from the first longitudinal edge and have closed ends in the ground contact surface, each of the first crown sipes has an opening width at the ground contact surface which is constant in a longitudinal direction of the sipe, each of the second crown sipes has an opening width at the ground contact surface which is constant in a longitudinal direction of the sipe, and each of the third crown sipes has an opening width which decreases continuously from the first longitudinal edge toward the closed end thereof.