A winter tire includes a tread portion with a ground contact surface. The ground contact surface of the tread portion is provided with a recess. The recess is provided with a hole for fixing a stud pin and at least one projection extending radially outwardly and arranged at a location apart from the hole.

A tire for an aeroplane with the tread (2) comprising two shoulder ribs (6) having an axial width L.sub.S, each shoulder rib (6) comprises cavities (8) that open onto the tread surface (3), forming an opening surface (81) inscribed in a circle of diameter D. These cavities (8) are distributed circumferentially at a circumferential spacing P and along a periodic curve (9) having a period T and an amplitude A. The circumferential spacing P between two consecutive cavities (8) is at most equal to 0.2 times the period T of the periodic curve (9), the period T of the periodic curve (9) is at most equal to the circumferential length L.sub.C of the contact patch (31), and the amplitude A of the periodic curve (9) is at most equal to 0.5 times the axial width L.sub.S of the shoulder rib (6).

A buoyant vehicle tire device for facilitating driving in muddy soil includes a tire having an exterior wall and a pair of side walls is attached to each one of a pair of side edges of the exterior wall. A vehicle rim is sealed against the end edge of each side wall and encloses a pressurized space between the side walls and the exterior wall of the tire and the vehicle rim. A valve is coupled to the vehicle rim and is in fluid communication with the pressurized space. A plurality of depressions is positioned on the exterior wall and is pushed out from a first position to a second position when the pressurized space receives additional air. The first position of each of the depressions has a container space receiving air when driving in muddy soil, wherein the depressions provide buoyancy to the tire in muddy soil.

The present invention concerns tire treads having projecting features comprising wear indicators, stone ejectors, and/or noise suppressors arranged within voids submerged below the top, outer side of a tread. Particular embodiments of the invention provide a tire tread having a submerged void extending into to the tread thickness from the bottom side of the tread to a terminal location spaced below the tread top side, the top side forming a ground-engaging side of the tread. Such embodiments further include a plurality of projecting features arranged within the submerged void below the terminal location of the submerged void, the plurality of projecting features being further arranged in a spaced arrangement along a length of the submerged void, each of the plurality of projecting features extending partially across a width of the submerged void, which may comprise a groove, for example. The invention includes methods of forming the tread and a treaded tire.

A tread pattern is provided with: shoulder lug grooves open at ground contact ends; center lug grooves each having opposite ends; circumferential primary grooves each formed in a wavy shape by connecting ends of the center lug grooves and the inner ends of the shoulder lug grooves in the width direction of the tire; and center blocks defined by the center lug grooves and the pair of circumferential primary grooves. The width of the circumferential primary grooves is smaller than the width of the shoulder lug grooves. The center lug grooves are tilted relative to both the circumferential direction and the width direction of the tire and each have a third groove turning portion and a fourth groove turning portion which protrude in the different directions in the circumferential direction of the tire.

To provide a motorized two-wheeled vehicle tire for traveling on uneven terrain, the block durability performance of which has been improved; and a tire vulcanization mold capable of molding said tire. A motorized two-wheeled vehicle tire for traveling on uneven terrain wherein multiple blocks are provided on the tread at intervals in the tire circumference direction. Recesses are provided on the bottom surfaces of the grooves. Multiple recesses are provided at intervals in the axial direction of the tire. Spew, which was drawn up into the vent holes of the mold during vulcanization molding, or removal marks thereof are provided between each recess and the block that is adjacent in the tire circumference direction.

The pneumatic tire described herein is provided with, in a tread surface, at least two circumferential grooves continuously extending in a tread circumferential direction, and a resonator disposed in a land part defined between two circumferential grooves having different sectional areas of the at least two circumferential grooves, the resonator having an air chamber opened to a land part surface in a position separated away from the circumferential groove, one or more narrowed necks communicating the air chamber with one of the two circumferential grooves, and one or more narrowed necks communicating the air chamber with the other circumferential groove, wherein a sectional area S1 of the narrowed neck of the resonator, opened to a circumferential groove with a relatively large sectional area is larger than a sectional area S2 of the narrowed neck of the resonator, opened to a circumferential groove with a relatively small sectional area.

A motor vehicle tire, particularly for front wheels of motor vehicles, has a tread extending around an axis of rotation and includes a central annular portion which straddles an equatorial plane and two annular shoulder portions arranged on axially opposite sides of the central annular portion. The tread band has a void-to-rubber ratio of less than 10%, and the central annular portion has an axial extension less than 40% of the axial development of the tread band and includes at least a pair of first grooves extending substantially longitudinally on opposite sides of the equatorial plane. Each shoulder portion has an axial extension less than 35% of the axial development of the tread band and includes a plurality of second grooves extending substantially transversally forming an average angle with the equatorial plane of more than 90. The central annular portion has a void-to-rubber ratio more than 0.15 and the first grooves include at least one first segment and at least one second segment which is inclined with respect to the first segment so as to form a concavity directed toward the equatorial plane. The first segment of each first groove is shorter than the second segment and precedes the second segment in the tire rolling direction.

The pneumatic tire described herein is provided with, in a tread surface, at least two circumferential grooves continuously extending in a tread circumferential direction, and a resonator disposed in a land part defined between two circumferential grooves having different sectional areas of the at least two circumferential grooves, the resonator having an air chamber opened to a land part surface in a position separated away from the circumferential groove, one or more narrowed necks communicating the air chamber with one of the two circumferential grooves, and one or more narrowed necks communicating the air chamber with the other circumferential groove, wherein a sectional area S1 of the narrowed neck of the resonator, opened to a circumferential groove with a relatively large sectional area is smaller than a sectional area S2 of the narrowed neck of the resonator, opened to a circumferential groove with a relatively small sectional area.

Motor vehicle tyre adapted to be mounted on the rear wheel of a motor vehicle, includes a tread band having a tread pattern including a module which is repeated along a direction of circumferential extension of the tyre. The module has at least one first pair of first grooves inclined in opposite directions with respect to an equatorial plane of the tyre, and extending from the equatorial plane toward a respective shoulder; at least one second pair of second grooves inclined in opposite directions with respect to the equatorial plane and extending from the equatorial plane toward a respective shoulder. The first and the second grooves are staggered relative to each other in the circumferential direction in such a way as to maintain a substantially constant distance of less than half the pitch, at the equatorial plane between each first or second groove and the adjacent one in the circumferential direction.