Motorcycles tyre

A motorcycle tyre, having an equatorial plane (X-X) and a tread band comprising a plurality of grooves forming a tread pattern with a module replicated along a circumferential direction of the tyre and a predetermined circumferential length, wherein the module comprising:

• a pair of circumferential grooves arranged on opposite sides with respect to the equatorial plane (X-X) of the tyre, the circumferential grooves extending along the circumferential direction for only part of the predetermined circumferential length of the module and defining between them a central portion of the tread band having a void to solid ratio substantially equal to zero and a predetermined axial width, wherein each groove of the pair of circumferential grooves extends in the module along the circumferential direction of the tyre for a circumferential segment having a length shorter than the predetermined circumferential length of the module;
• a plurality of pairs of transversal grooves arranged on opposite sides with respect to the equatorial plane (X-X) of the tyre at a distance from the equatorial plane (X-X) of the tyre greater than a distance from the circumferential grooves to the equatorial plane (X-X) of the tyre;
• and
• a pair of first lateral annular portions axially arranged between the pair of circumferential grooves and the plurality of pairs of transversal grooves, each of the first lateral annular portions comprising, in a position axially adjacent to the respective circumferential groove, a respective part having a circumferential length at least equal to that of the circumferential grooves and a void to solid ratio substantially equal to zero;
• wherein the tyre has a curvature ratio lower than about 0.32,
• wherein the module comprises a pair of secondary grooves arranged on opposite sides with respect to the equatorial plane (X-X) of the tyre, each of the secondary grooves being in a position circumferentially adjacent to a respective groove of the pair of circumferential grooves, and
• wherein the grooves of the pair of secondary grooves have respective first ends proximal to the equatorial plane (X-X) of the tyre and opposite second ends distal from the equatorial plane (X-X) of the tyre, wherein the first ends of the grooves of the pair of secondary grooves are spaced apart from each other by a first axial segment having a width less than the predetermined axial width of the central portion of the tread band and the second ends of the grooves of the pair of secondary grooves are spaced apart from each other by a second axial segment having a width greater than the predetermined axial width of the central portion of the tread band.

A motorcycle tyre, having an equatorial plane (X-X) and a tread band comprising a plurality of grooves forming a tread pattern with a module replicated along a circumferential direction of the tyre and a predetermined circumferential length, wherein the module comprising:

• a pair of circumferential grooves arranged on opposite sides with respect to the equatorial plane (X-X) of the tyre, the circumferential grooves extending along the circumferential direction for only part of the predetermined circumferential length of the module and defining between them a central portion of the tread band having a void to solid ratio substantially equal to zero and a predetermined axial width, wherein each groove of the pair of circumferential grooves extends in the module along the circumferential direction of the tyre for a circumferential segment having a length shorter than the predetermined circumferential length of the module;
• a plurality of pairs of transversal grooves arranged on opposite sides with respect to the equatorial plane (X-X) of the tyre at a distance from the equatorial plane (X-X) of the tyre greater than a distance from the circumferential grooves to the equatorial plane (X-X) of the tyre;
• and
• a pair of first lateral annular portions axially arranged between the pair of circumferential grooves and the plurality of pairs of transversal grooves, each of the first lateral annular portions comprising, in a position axially adjacent to the respective circumferential groove, a respective part having a circumferential length at least equal to that of the circumferential grooves and a void to solid ratio substantially equal to zero;
• wherein the tyre has a curvature ratio lower than about 0.32, and
• wherein the length of the circumferential segment ranges from about 60% to about 80% of the predetermined circumferential length of the module.