A motorcycle tire comprising a toroidal carcass and a tread reinforcing layer disposed radially outside the carcass in a tread portion of the tire, wherein the tread reinforcing layer comprises a ply reinforcing structure in which a tape of at least one reinforcing cord coated with topping rubber is wound, the ply reinforcing structure comprises a plurality of first oblique segments in which the tape is inclined with respect to the tire circumferential direction to one side in the tire axial direction, and a plurality of second oblique segments in which the tape is inclined with respect to the tire circumferential direction to the other side in the tire axial direction so that the second oblique segments intersect the first oblique segments, and the first oblique segments are arranged so that the side edges thereof do not contact with each other, and the second oblique segments are arranged so that the side edges thereof do not contact with each other, whereby the intersecting first and second oblique segments (16, 17) form a mesh structure having rhombic spaces, characterized in that circumferential lengths (La) of the rhombic spaces are less than 2/3 times a maximum circumferential length of a ground contacting patch of the tread surface of the tread portion occured when the tire in its normally loaded state is contacted with a flat horizontal surface at a camber angle of 0 degree, wherein the normally loaded state is such that the tire is mounted on a standard wheel rim and inflated to a standard pressure and loaded with a standard tire load, wherein the standard wheel rim is a wheel rim officially approved or recommended for the tire by standards organizations, i.e. JATMA (Japan and Asia), T&RA (North America), ETRTO (Europe), TRAA (Australia), STRO (Scandinavia), ALAPA (Latin America), ITTAC (India) and the like which are effective in the area where the tire is manufactured, sold or used, and the standard pressure and the standard tire load are the maximum air pressure and the maximum tire load for the tire specified by the same organization in the Air-pressure/Maximum-load Table or similar list, and the circumferential lengths (La) of the rhombic spaces are not less than 2/5 times the maximum circumferential length of the ground contacting patch of the tread surface. the tread reinforcing layer comprises a ply reinforcing structure in which a tape of at least one reinforcing cord coated with topping rubber is wound, the ply reinforcing structure comprises a plurality of first oblique segments in which the tape is inclined with respect to the tire circumferential direction to one side in the tire axial direction, and a plurality of second oblique segments in which the tape is inclined with respect to the tire circumferential direction to the other side in the tire axial direction so that the second oblique segments intersect the first oblique segments, and a plurality of first oblique segments in which the tape is inclined with respect to the tire circumferential direction to one side in the tire axial direction, and a plurality of second oblique segments in which the tape is inclined with respect to the tire circumferential direction to the other side in the tire axial direction so that the second oblique segments intersect the first oblique segments, and the first oblique segments are arranged so that the side edges thereof do not contact with each other, and the second oblique segments are arranged so that the side edges thereof do not contact with each other, whereby the intersecting first and second oblique segments (16, 17) form a mesh structure having rhombic spaces, characterized in that circumferential lengths (La) of the rhombic spaces are less than 2/3 times a maximum circumferential length of a ground contacting patch of the tread surface of the tread portion occured when the tire in its normally loaded state is contacted with a flat horizontal surface at a camber angle of 0 degree, wherein the normally loaded state is such that the tire is mounted on a standard wheel rim and inflated to a standard pressure and loaded with a standard tire load, wherein the standard wheel rim is a wheel rim officially approved or recommended for the tire by standards organizations, i.e. JATMA (Japan and Asia), T&RA (North America), ETRTO (Europe), TRAA (Australia), STRO (Scandinavia), ALAPA (Latin America), ITTAC (India) and the like which are effective in the area where the tire is manufactured, sold or used, and the standard pressure and the standard tire load are the maximum air pressure and the maximum tire load for the tire specified by the same organization in the Air-pressure/Maximum-load Table or similar list, and the circumferential lengths (La) of the rhombic spaces are not less than 2/5 times the maximum circumferential length of the ground contacting patch of the tread surface.