A tire comprising: a tread portion having a designated install direction to a vehicle so as to have an inboard tread edge (Ti) which is intended to be positioned toward the center of a vehicle body of a vehicle when the tire is installed to the vehicle and an outboard tread edge (To) which is intended to be positioned away from the center of the vehicle body when the tire is installed to the vehicle; the tread portion being provided with an inboard shoulder main groove extending continuously in a tire circumferential direction on the side of the inboard tread edge (Ti) to form an inboard shoulder land portion between the inboard tread edge (Ti) and the inboard shoulder main groove, and an outboard shoulder main groove extending continuously in the tire circumferential direction on the side of the outboard tread edge (To) with a width smaller than a width of the inboard shoulder main groove to form an outboard shoulder land portion between the outboard tread edge (To) and the outboard shoulder main groove; the inboard shoulder land portion being provided with a plurality of inboard shoulder lug grooves each extending inwardly in a tire axial direction from at least the inboard tread edge (Ti) and terminated within the inboard shoulder land portion; and the outboard shoulder land portion being provided with a plurality of outboard shoulder lug grooves each extending inwardly in the tire axial direction from at least the outboard tread edge (To) to the outboard shoulder main groove, wherein the tread portion is further provided with a crown main groove extending continuously in the tire circumferential direction between the inboard shoulder main groove and the outboard shoulder main groove, wherein the tread portion further comprises an outboard middle land portion between the outboard shoulder main groove and the crown main groove, the outboard middle land portion is provided with a plurality of first middle narrow grooves extending from the crown main groove and terminated within the outboard middle land portion and a plurality of second middle narrow grooves extending from the outboard shoulder main groove and terminated within the outboard middle land portion, the lengths in the tire axial direction of the plurality of second middle narrow grooves are shorter than the lengths in the tire axial direction of the plurality of first middle narrow grooves, characterized in that the tread portion further comprises an inboard middle land portion between the inboard shoulder main groove and the crown main groove, and the inboard middle land portion is provided with a plurality of inboard middle narrow grooves extending completely across the inboard middle land portion. a tread portion having a designated install direction to a vehicle so as to have an inboard tread edge (Ti) which is intended to be positioned toward the center of a vehicle body of a vehicle when the tire is installed to the vehicle and an outboard tread edge (To) which is intended to be positioned away from the center of the vehicle body when the tire is installed to the vehicle; the tread portion being provided with an inboard shoulder main groove extending continuously in a tire circumferential direction on the side of the inboard tread edge (Ti) to form an inboard shoulder land portion between the inboard tread edge (Ti) and the inboard shoulder main groove, and an outboard shoulder main groove extending continuously in the tire circumferential direction on the side of the outboard tread edge (To) with a width smaller than a width of the inboard shoulder main groove to form an outboard shoulder land portion between the outboard tread edge (To) and the outboard shoulder main groove; the inboard shoulder land portion being provided with a plurality of inboard shoulder lug grooves each extending inwardly in a tire axial direction from at least the inboard tread edge (Ti) and terminated within the inboard shoulder land portion; and the outboard shoulder land portion being provided with a plurality of outboard shoulder lug grooves each extending inwardly in the tire axial direction from at least the outboard tread edge (To) to the outboard shoulder main groove, wherein the tread portion is further provided with a crown main groove extending continuously in the tire circumferential direction between the inboard shoulder main groove and the outboard shoulder main groove,