A tyre comprising: a tread portion having a designated mounting direction to a vehicle, the tread portion comprising an outboard tread edge (To) and an inboard tread edge (Ti) which are respectively located outside and inside of a vehicle when being mounted to the vehicle, wherein the outboard tread edge (To) and the inboard tread edge (Ti) are the axial outermost edges of the ground contacting patch of the tyre which occurs under the condition such that the tyre under a normal state is grounded on a plane with a standard tyre load at zero camber angles, four circumferential grooves extending continuously in a tyre circumferential direction between the outboard tread edge (To) and the inboard tread edge (Ti), and five land portions divided by the four circumferential grooves, the four circumferential grooves comprising an inboard shoulder circumferential groove located nearest to the inboard tread edge (Ti) in the four circumferential grooves, the five land portions comprising an inboard shoulder land portion disposed outward in the tyre axial direction of the inboard shoulder circumferential groove, the inboard shoulder land portion having a ground contact surface with a smallest width in the tyre axial direction in the five land portions, the inboard shoulder land portion being provided with a plurality of inboard shoulder lateral grooves and a plurality of inboard shoulder sipes, the plurality of inboard shoulder lateral grooves comprising inner ends that are located by a distance in the tyre axial direction away from the inboard shoulder circumferential groove, the plurality of inboard shoulder lateral grooves extending outward in the tyre axial direction from the inner ends to a location beyond the inboard tread edge (Ti), and the plurality of inboard shoulder sipes extending from the inboard shoulder circumferential groove to a location beyond the inboard tread edge (Ti), wherein the five land portions comprise an inboard middle land portion adjacent to the inboard shoulder land portion via the inboard shoulder circumferential groove, the inboard middle land portion is provided with a plurality of inboard middle traverse-sipes that traverses the inboard middle land portion completely in the tyre axial direction, and the plurality of inboard middle traverse-sipes each comprises a pair of sipe edges each having a chamfer portion. a tread portion having a designated mounting direction to a vehicle, the tread portion comprising an outboard tread edge (To) and an inboard tread edge (Ti) which are respectively located outside and inside of a vehicle when being mounted to the vehicle, wherein the outboard tread edge (To) and the inboard tread edge (Ti) are the axial outermost edges of the ground contacting patch of the tyre which occurs under the condition such that the tyre under a normal state is grounded on a plane with a standard tyre load at zero camber angles, four circumferential grooves extending continuously in a tyre circumferential direction between the outboard tread edge (To) and the inboard tread edge (Ti), and five land portions divided by the four circumferential grooves, the four circumferential grooves comprising an inboard shoulder circumferential groove located nearest to the inboard tread edge (Ti) in the four circumferential grooves, the five land portions comprising an inboard shoulder land portion disposed outward in the tyre axial direction of the inboard shoulder circumferential groove, the inboard shoulder land portion having a ground contact surface with a smallest width in the tyre axial direction in the five land portions, the inboard shoulder land portion being provided with a plurality of inboard shoulder lateral grooves and a plurality of inboard shoulder sipes, the plurality of inboard shoulder lateral grooves comprising inner ends that are located by a distance in the tyre axial direction away from the inboard shoulder circumferential groove, the plurality of inboard shoulder lateral grooves extending outward in the tyre axial direction from the inner ends to a location beyond the inboard tread edge (Ti), and the plurality of inboard shoulder sipes extending from the inboard shoulder circumferential groove to a location beyond the inboard tread edge (Ti), wherein the five land portions comprise an inboard middle land portion adjacent to the inboard shoulder land portion via the inboard shoulder circumferential groove, the inboard middle land portion is provided with a plurality of inboard middle traverse-sipes that traverses the inboard middle land portion completely in the tyre axial direction, and the plurality of inboard middle traverse-sipes each comprises a pair of sipe edges each having a chamfer portion.