A tire having a tread which is divided in the tire width direction into a first shoulder region, a second shoulder region and a central region located between the first shoulder region and the second shoulder region, the tire comprising a first plurality of studs installed in the first shoulder region, a second plurality of studs installed in the second shoulder region and a third plurality of studs installed in the central region, each of said studs (9, 11, 13) comprising a body and a stud pin with a pin end protruding out of the body, the body being at least partially embedded in the tread and the pin end having a pin end size, the pin end size being the cross-section area of said tip end when viewed in top view onto the tread, wherein (i) at least a part of the third plurality of the studs extends longitudinally into the tread in a direction inclined relative to the normal of the radially outer surface of the tread by a first angle (α) in the circumferential direction of the tire, and wherein at least a part of the first and/or second plurality of studs (9, 11) extends longitudinally into the tread in a direction inclined relative to the normal of the radially outer surface of the tread in a direction different from the direction of the third plurality of the studs; and/or (ii) at least a part of the first plurality of studs installed in the first shoulder region and/or at least a part of the second plurality of studs installed in the second shoulder extends longitudinally into the tread in a direction inclined relative to the normal of the radially outer surface of the tread by a second angle (β) in the tire width direction; and/or (iii) at least a part of the third plurality of the studs extends longitudinally into the tread in a direction inclined relative to the normal of the radially outer surface of the tread by a first angle (α) in the circumferential direction of the tire, and wherein the pin end size of the third plurality of studs is smaller than the pin end size of the first and/or second plurality of studs (9, 11); characterized in that the pin ends of the studs of at least one of said regions (3, 5, 7) have an arrowhead shape or an elongated shape. (i) at least a part of the third plurality of the studs extends longitudinally into the tread in a direction inclined relative to the normal of the radially outer surface of the tread by a first angle (α) in the circumferential direction of the tire, and wherein at least a part of the first and/or second plurality of studs (9, 11) extends longitudinally into the tread in a direction inclined relative to the normal of the radially outer surface of the tread in a direction different from the direction of the third plurality of the studs; and/or (ii) at least a part of the first plurality of studs installed in the first shoulder region and/or at least a part of the second plurality of studs installed in the second shoulder extends longitudinally into the tread in a direction inclined relative to the normal of the radially outer surface of the tread by a second angle (β) in the tire width direction; and/or (iii) at least a part of the third plurality of the studs extends longitudinally into the tread in a direction inclined relative to the normal of the radially outer surface of the tread by a first angle (α) in the circumferential direction of the tire, and wherein the pin end size of the third plurality of studs is smaller than the pin end size of the first and/or second plurality of studs (9, 11);