A winter tire includes a tread portion with a designated rotational direction. The tread portion is provided with at least one central block on a tire equator. The central block includes a first tapered portion. The first tapered portion includes an axial width gradually decreasing toward the rotational direction and a leading edge extending along an axial direction of the tire. The first tapered portion is provided with a hole for installing a stud pin.

A stud pin for mounting in a pneumatic tire includes a tip including a tip end surface configured to come into contact with a road surface, and a body portion configured to house the tip. An end surface of the tip configured to come into contact with a road surface comprises an axis of symmetry which defines a line symmetrical shape of the end surface; a centroid of a shape of the end surface offset to a first side in an axial direction from a center position of a range the end surface covers in the axial direction of the axis of symmetry; and a recessed portion recessed inward of the end surface, the recessed portion being provided on, of peripheries of the end surface, a periphery of the end surface running between a first most distal end portion and a second most distal end portion.

Segmented tires employ segments featuring cooperating recesses and protrusions at opposing sides thereof for mating of the segments with one another in the assembled tire body. Cleated tires with embedded cleats of greater rigidity than the tire body material provide improved traction in muddy or other slippery conditions while the compressible tire body smooths out the ride harshness of the tire. Mounting elements are also embedded within the segments of the tire body for secure mounting and reliable retention of the segments.

A tyre includes a tread having tread blocks; a plurality of stud holes; and a plurality of studs installed in at least some of the stud holes. A constellation of the studs is such that less than two studs are in a line perpendicular to a rolling direction of the tyre. Less than two studs within an area of a footprint are in the same line parallel to the rolling direction. A distance between two adjacent studs is more than 20 mm.

A tyre (200) includes a tread (210) having tread blocks (220) with grooves (230) arranged between the tread blocks (220) and studs (100, 100a, 100b) installed into at least some of the tread blocks (220). A central region (CR) of the tread (210) is arranged between a first shoulder region (SR1) of the tread (210) and a second shoulder region (SR2) of the tread (210). At least some of the tread blocks (220) are provided with sipes (240). The tyre (200) has a first density of sipes (240) in the central region (CR), a second density of sipes (240) in the first shoulder region (SR1), and a third density of sipes (240) in the second shoulder region (SR2). The first density of sipes (240) is at least 15% greater than either or both of the second density of sipes (240) and the third density of sipes (240).

The present invention provides a stud and tool to remove the same.

A steel-cleated, all terrain tire has cleats that dynamically engage with changing road conditions, across slick ice and bridges, and while turning, breaking and accelerating on steep terrain. The tire design can provide stability and an enormous safety benefit in dangerous conditions, on demand, without the driver's intervention. The tire design can be used for military vehicles and aircraft, commercial jets, turboprop aircraft, heavy equipment, commercial diesel trucks, helicopters, law enforcement vehicles, fire and rescue vehicles, school buses, government vehicles, sport cars, and the like. The tire design include spring loaded cleats that can are spaced about and extend outward from the tire's surface. The spring load may be strong enough to permit the cleat to penetrate ice and the like, while not damaging asphalt or concrete roadways.

Noise-reducing device intended to be added to a groove of the tread of a tire comprising an elastic sole preferably extending in a given longitudinal direction, wherein the said sole on one of its faces comprises one or several flexible walls the planes of which run substantially perpendicular to the longitudinal direction of the sole.

A pneumatic tire includes stud pins inserted into holes disposed in the tire surface. The stud pins each include a body portion and a flange disposed closer to the bottom side of each of the holes than the body portion and having an outer diameter larger than the body portion. The holes each include a securing portion coming into contact with the outer peripheral surface of the body portion of the stud pin to secure the stud pin and an enlarged diameter portion disposed closer to the bottom wall side of the hole than the securing portion, having an inner diameter larger than the securing portion, and coming into contact with the outer peripheral surface of the flange of the stud pin to secure the stud pin. The side wall of the enlarged diameter portion is provided with a protrusion protruding toward the interior of the hole.

A studded tire includes stud pins embedded in a road contact surface of a tread portion 1; the rubber composition forming the tread portion containing at least one of natural rubber, styrene-butadiene rubber, and butadiene rubber, from 5 to 50 parts by weight of carbon black and from 5 to 70 parts by weight of silica per 100 parts by weight of the diene rubber; a nitrogen adsorption specific surface area of the carbon black being from 50 to 120 m.sup.2/g; a CTAB specific surface area of the silica being from 80 to 190 m.sup.2/g; a rubber hardness of the rubber composition being not greater than 60; and a product of a stress at the time of 400% elongation and a bottom surface area of a flange portion on a bottom side of the stud pins being not less than 400 MPa.Math.mm.sup.2 and not greater than 850 MPa.Math.mm.sup.2.