A tyre, comprising: - a carcass; - at least one high elongation belt, being applied as a single cord strip radially externally to said carcass, said high elongation belt embedding a cord provided with a stiffness module variable between about 3.000 MPa for a strain value of said cord ranging from 0 to about 2% and 125.000 MPa for a strain value of said cord higher than about 2%; and - an external tread portion, provided with two or more grooves extending according to a circumferential direction around said tread portion, wherein the axial width (W g) of both said grooves, measured according to an axial direction parallel to an axis of rotation of said tyre and orthogonal to said circumferential direction, is lower than, or at least equal to, 2 millimeters. the tyre comprising a first belt, a second belt, a third belt and a fourth belt, each having a respective belt cord angle (θ 1, θ 2, θ 3, θ 4), wherein at least one of said first, second, third and fourth belt (1, 2, 3, 4) is a high elongation belt applied as a single cord strip and having a belt cord angle (θ 2) equal to 0°, wherein the ratio between the angles of the belts with respect to the first belt cord angle (θ 1) is defined as follows: - The second belt cord angle (θ 2) equals to 0°; - The third belt cord angle (θ 3) equals to 60% - 80%, preferably to 70% of the first belt cord angle (θ 1) and - the fourth belt cord angle (θ 4) equals to 120% - 140%, preferably to 130% of the first belt cord angle (Θ 1), - a carcass; - at least one high elongation belt, being applied as a single cord strip radially externally to said carcass, said high elongation belt embedding a cord provided with a stiffness module variable between about 3.000 MPa for a strain value of said cord ranging from 0 to about 2% and 125.000 MPa for a strain value of said cord higher than about 2%; and - an external tread portion, provided with two or more grooves extending according to a circumferential direction around said tread portion, wherein the axial width (W g) of both said grooves, measured according to an axial direction parallel to an axis of rotation of said tyre and orthogonal to said circumferential direction, is lower than, or at least equal to, 2 millimeters. the tyre comprising a first belt, a second belt, a third belt and a fourth belt, each having a respective belt cord angle (θ 1, θ 2, θ 3, θ 4), wherein at least one of said first, second, third and fourth belt (1, 2, 3, 4) is a high elongation belt applied as a single cord strip and having a belt cord angle (θ 2) equal to 0°, wherein the ratio between the angles of the belts with respect to the first belt cord angle (θ 1) is defined as follows: - The second belt cord angle (θ 2) equals to 0°; - The third belt cord angle (θ 3) equals to 60% - 80%, preferably to 70% of the first belt cord angle (θ 1) and - the fourth belt cord angle (θ 4) equals to 120% - 140%, preferably to 130% of the first belt cord angle (Θ 1), - The second belt cord angle (θ 2) equals to 0°; - The third belt cord angle (θ 3) equals to 60% - 80%, preferably to 70% of the first belt cord angle (θ 1) and - the fourth belt cord angle (θ 4) equals to 120% - 140%, preferably to 130% of the first belt cord angle (Θ 1),