Disclosed is a tire stud comprising a stainless steel body with a flange and a blind hole and further comprising a spike installed in said hole, wherein the cross-sectional shape of the hole is different from the cross-sectional shape of the spike at least at one of: the opening, the lower surface of the spike, and a depth between the opening lower surface of the spike; whereby only protrusions of the spike are attached to the side wall of the hole with friction joints where the cross-sectional shape of the hole is different from the cross-sectional shape of the spike.

A chisel nut for use in improving traction of a ground engaging drive element of a vehicle includes a body having a first end for engaging the ground engaging drive element and a second end disposed opposite the first end. A chisel face is defined on a side of the body spaced a distance from the first end and extending to an edge at the second end of the body. The chisel face sized and configured to extend outward from the ground engaging drive element beyond lug members of the ground engaging drive element. A hole is defined in the body about a longitudinal axis and extends from an opening at the first end of the body toward the second end of the body. The hole includes a threaded portion for threadingly engaging with a threaded portion of a cooperatively sized fastener positioned in the hole.

A stud pin includes a tip, a body portion, and a lower flange. A flange profile shape of the lower flange is an anisotropic shape includes short sides and long sides of different lengths, and includes four or more first flange protrusion portions that project in the longitudinal direction parallel with the long sides and two second flange protrusion portions that project in the lateral direction parallel with the short sides. A body profile shape of the body portion is a shape including body linear portions extending in a linear manner. The body linear portions are disposed facing a portion of the flange profile shape between two adjacent protrusion portions of the first flange protrusion portion and the second flange protrusion portion along the outer circumference of the flange profile shape.

A method for installing a stud in a tyre. The method includes identifying a stud hole for the stud in the tyre; imaging the vicinity of at least the stud hole, whereby information is received about the pattern in the vicinity of the stud hole, and using the received information to determine [i] the stud type suitable for the stud suitable in the stud hole and/or [ii] the suitable stud orientation of the stud suitable in the stud hole. The method includes providing a stud and installing it in a stud hole. The stud type of the stud is the same as the suitable stud type of a stud suitable in the stud hole; and/or the stud is installed in the stud hole in such a way that the main direction of the stud is parallel with the suitable stud orientation. Further a tyre studded by the method.

A vehicle tire including a tread intended for a rolling contact against a foundation, the tread having a tread pattern which includes circumferential and transverse grooves for removing water from a contact patch between the foundation and the tire, and anti-skid studs mounted in the tread and including a stud body and a hard metal pin secured thereto. An end of the metal pin, intended against a foundation, is formed as an inclined surface, whereby the metal pin has its end provided with the inclined surface acting on the foundation in an axial direction of the metal pin to a varying depth and the inclined surface being placed relative to a rotating direction of the tire in such an orientation that, as the tire is rolling freely forward, a leading edge of the hard metal pin to impinge first on the foundation is lower than a trailing edge.

A stud pin includes a buried base portion embedded in a tread portion of a pneumatic tire and a tip portion protruding from the road contact surface of the tread portion when the buried base portion is embedded in the tread portion. A tip surface of the tip portion includes: a first protrusion portion and a second protrusion portion longer in the tire width direction than in the tire circumferential direction and protruding toward one side in the tire circumferential direction; a first recessed portion disposed between the first and second protrusion portions and recessed toward the other side in the tire circumferential direction; a third protrusion portion and a fourth protrusion portion protruding toward the other side in the tire circumferential direction; and a second recessed portion disposed between the third and fourth protrusion portions and recessed toward the one side in the tire circumferential direction.

A stud pin includes a tip including a tip end surface configured to come into contact with a road surface and a trunk portion that supports the tip and extends in one direction. The trunk portion includes an upper flange disposed at a first end of the trunk portion, the tip being fixed to the upper flange, and a lower flange disposed at a position to a side opposite the upper flange of the trunk portion. An upper end surface of the upper flange from which the tip protrudes includes a recessed surface, the recessed surface including a smooth inclined surface recessing in a curved manner or a linear manner toward the lower flange with advancement toward a protruding base portion of the tip.

A stud pin includes a tip, a body portion that supports the tip, and a lower flange connected to the body portion at an end on an opposite side to the end surface. A profile shape of the lower flange and a body profile shape of the body portion are anisotropic shape. The flange profile shape includes four or more first flange protrusion portions projecting toward the longitudinal direction and two second flange protrusion portions projecting toward the lateral direction. The body profile shape includes four or more first body protrusion portions projecting toward the lateral direction and two second body protrusion portions projecting toward the longitudinal direction.

This invention relates to a tire having a directional tread pattern with a first shoulder region, a central region, and a second shoulder region, the tire having a plurality of studs in the first shoulder region, the second shoulder region, and the central region; wherein at least some of the plurality of the studs in the central shoulder region extends longitudinally into the tread member in a direction inclined relative to the normal of the outer surface of the tread member by an angle in the circumferential direction of the tire, and wherein at least some of the studs in the first shoulder region and the second shoulder region extend longitudinally into the tread in a direction inclined relative to the normal of the outer surface of the tread in a direction different from the studs in the central region.

A stud pin includes a tip including an end surface that comes into contact with a road surface, a body portion that supports the tip; and a lower flange connected to the body portion at an end on an opposite side to the end surface. A profile shape of the lower flange is an anisotropic shape in which, of imaginary rectangles circumscribing the profile shape, a first smallest rectangle with the shortest side of its four sides being the shortest and/or a second smallest rectangle with the longest side of its four sides being the shortest includes short sides and long sides of different lengths. The profile shape includes four or more first protrusion portions that project in the longitudinal direction parallel with the long sides and two second protrusion portions that project in the lateral direction parallel with the short sides.