A tyre comprising: a carcass; a tread band radially external to said carcass, and a belt structure interposed between said carcass and said tread band, said belt structure including: at least two plies (106a, 106b) incorporating a plurality of reinforcing cords parallel to each other in each ply and intersecting with respect to the adjacent ply, said cords being oriented so as to form a predetermined angle with respect to a circumferential direction, and at least one belt layer (107, 107') radially external to said crossed plies (106a, 106b) and extending at least for the axial width of said crossed plies (106a, 106b), said belt layer (107, 107') comprising at least a first elongated element and at least a second elongated element, said elongated elements (210, 220) being helically wound to form turns oriented in a substantially circumferential direction of the tyre, the turns of said first and second elongated elements (210,220) being disposed along the axial development of said belt layer (107, 107') according to a predetermined sequence of alternatively disposed turns of said first and second elongated elements (210,220), said first elongated element being a hybrid cord comprising at least a high elastic modulus filament, having a load at a specific extension of 1% (LASE 1%) greater than or equal to 3 cN/dTex, and a low elastic modulus filament, having a load at a specific extension of 5% (LASE 5%) lower than or equal to 5 cN/dTex, twisted together, said second elongated element having an elastic modulus lower than the elastic modulus of said first elongated element. a carcass; a tread band radially external to said carcass, and a belt structure interposed between said carcass and said tread band, said belt structure including: at least two plies (106a, 106b) incorporating a plurality of reinforcing cords parallel to each other in each ply and intersecting with respect to the adjacent ply, said cords being oriented so as to form a predetermined angle with respect to a circumferential direction, and at least one belt layer (107, 107') radially external to said crossed plies (106a, 106b) and extending at least for the axial width of said crossed plies (106a, 106b), said belt layer (107, 107') comprising at least a first elongated element and at least a second elongated element, said elongated elements (210, 220) being helically wound to form turns oriented in a substantially circumferential direction of the tyre, at least two plies (106a, 106b) incorporating a plurality of reinforcing cords parallel to each other in each ply and intersecting with respect to the adjacent ply, said cords being oriented so as to form a predetermined angle with respect to a circumferential direction, and at least one belt layer (107, 107') radially external to said crossed plies (106a, 106b) and extending at least for the axial width of said crossed plies (106a, 106b), said belt layer (107, 107') comprising at least a first elongated element and at least a second elongated element, said elongated elements (210, 220) being helically wound to form turns oriented in a substantially circumferential direction of the tyre, the turns of said first and second elongated elements (210,220) being disposed along the axial development of said belt layer (107, 107') according to a predetermined sequence of alternatively disposed turns of said first and second elongated elements (210,220), said first elongated element being a hybrid cord comprising at least a high elastic modulus filament, having a load at a specific extension of 1% (LASE 1%) greater than or equal to 3 cN/dTex, and a low elastic modulus filament, having a load at a specific extension of 5% (LASE 5%) lower than or equal to 5 cN/dTex, twisted together, said second elongated element having an elastic modulus lower than the elastic modulus of said first elongated element.