A method for arranging stud pins in a pneumatic tire is a method for arranging stud pins in a tread portion at intervals in a tire width direction so as to form a plurality of rows. This method includes specifying an inner region, an intermediate region, and an outer region by virtually partitioning the tread portion into equal three parts from a center line extending in a tire circumferential direction to a ground contact end in the tire width direction outward. The method also includes arranging the stud pins such that among numbers of stud pins per row in the inner region, the intermediate region, and the outer region, the number in the outer region is the largest, the number in the intermediate region is the second largest, the number in intermediate region is the smallest.

The present invention relates to a tire stud, which enables a snow tire to be used in every season and is a ceramic tread structure, which: can be used in all weathers on dry roads, wet roads, and even on icy roads, reduces braking, handling, road frictional noise, and a tire inner heat generated during driving on a road; and has an integrated groove portion and pin, which are more advanced than a conventional metallic tread pin and groove portion, wherein the ceramic thread structure is an integrated ceramic stud, which is applied to various stud patterns such as an existing rib type, rug type, rib and rug type, block type, and asymmetrical type, is particularly suitable even for an airless tire, being a next-generation tire, and is made of ceramic.

The invention relates to a method for manufacturing a studded pneumatic tire, the method comprising steps of producing an annular carcass by providing a first ply material comprising first cords), wherein the first cords comprise aramid, aramid content of the first cords being at least 50 wt. % of total weight of the first cords, winding at least a layer of the first ply material onto a carcass drum, thereby forming a cylindrical carcass preform, arranging two cables to the cylindrical carcass preform, and expanding the preform, thereby forming the annular carcass, forming a preassembly of belts and a tread, arranging the preassembly of belts and a tread onto the annular carcass to form a preform, vulcanizing the preform, and installing studs. The invention further relates to a studded pneumatic tire.

A tire mold comprises sector molds for forming a tread portion of a tire and mold pins provided on the sector molds for forming insertion holes in the tread portion. The insertion holes each comprise a first hole portion with a first inner diameter where a body portion of a stud pin is disposed and a second hole portion with a second inner diameter greater than the first inner diameter where a bottom flange portion of the stud pin is disposed. The mold pins each comprise a trunk portion with a first outer diameter for forming the first hole portion and a tip portion with a second outer diameter greater than the first outer diameter for forming the second hole portion.

The needle (12) of the device for inserting a wire into a tire has: a piercing zone (18) having an axis of symmetry, and a duct (30) having a proximal opening and a distal opening (36) opening into the zone (18) and off-center relative to the axis, the duct consisting of the proximal opening and of a rectilinear profiled section including the distal opening.