Tyre for motorcycles

摘要

Tire for motorcycles, having a tread band includes a central annular portion symmetrically located astride an equatorial plane and two shoulder annular portions located on axially opposite sides with respect to the central annular portion. The tread band has a void-to-rubber ratio not greater than 25%. The central annular portion has an axial extension not greater than 65% of the axial development of the tread band and the central portion has at least one module circumferentially repeated. Each shoulder portion has an axial extension not greater than 40% of the axial development of the tread band and the module includes at least one pair of first grooves with substantially circumferential course, at least partially located on opposite sides with respect to the equatorial plane. The central annular portion has a void-to-rubber ratio not smaller than 10% and the module includes a plurality of second grooves located substantially transversally with respect to the equatorial plane. The substantially transverse second grooves define in each module together with said first grooves at least two tread band solid portions. The second grooves have at least one end spaced away from the adjacent first groove by a distance so as to form a substantially continuous tread portion adapted to connect at least two tread band solid portions.

主权项

1. A tyre for motorcycles, having a tread band comprising a central annular portion symmetrically located astride an equatorial plane and two shoulder annular portions located on axially opposite sides with respect to the central annular portion,
the tread band having a void-to-rubber ratio not greater than 25%; the central annular portion having an axial extension not greater than 65% of the axial development of the tread band and said central portion having at least one module circumferentially repeated; each shoulder portion having an axial extension not greater than 40% of the axial development of the tread band; and said module comprising at least one pair of first grooves with substantially circumferential course, at least partially located on opposite sides with respect to the equatorial plane, wherein:
the central annular portion has a void-to-rubber ratio not smaller than 10% and said module comprises a plurality of second grooves located substantially transversally with respect to the equatorial plane,said substantially transverse second grooves defining in each module together with said substantially circumferential first grooves at least two tread band solid portions,said second grooves having at least one end spaced away from an adjacent first groove by a distance so as to form a substantially continuous tread portion adapted to connect at least two tread band solid portions, andin a same module, at least one second groove is located between two first grooves so as to cross the equatorial plane.