A tyre comprising: a tread portion comprising a first tread edge (T1), a second tread edge (T2), and a crown land portion arranged between the first tread edge (T1) and the second tread edge (T2), wherein the crown land portion comprises a first longitudinal edge extending in a tyre circumferential direction on a first tread edge (T1) side, a second longitudinal edge extending in the tyre circumferential direction on a second tread edge (T2) 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 (W6) 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 (W7) 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 (W8) which decreases continuously from the first longitudinal edge toward the closed end thereof. a tread portion comprising a first tread edge (T1), a second tread edge (T2), and a crown land portion arranged between the first tread edge (T1) and the second tread edge (T2), wherein the crown land portion comprises a first longitudinal edge extending in a tyre circumferential direction on a first tread edge (T1) side, a second longitudinal edge extending in the tyre circumferential direction on a second tread edge (T2) 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 (W6) 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 (W7) 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 (W8) which decreases continuously from the first longitudinal edge toward the closed end thereof. <EOS>