Patent ID: 7900669

Claim:
A studded air-filled vehicle tire, having a predetermined rolling direction, and comprising a rubber tread with pattern blocks, grooves separating said blocks and premade stud holes in said tread, said tire being provided with anti-slip studs each with a bottom end, a top end, and a total length therebetween, said studs being inserted in at least some of said stud holes, each of said studs comprising: a body with a bottom flange and a shank with a top bowl, said bottom flange having a substantially quadrangular shape with diagonal dimensions perpendicular to said total length and perpendicular to each other; and a hard piece of a different material than said body, and protruding out of said top bowl, said hard piece having a substantially square shape with side surfaces and edges therebetween, and diagonal dimensions extending from each edge to an opposing edge and being substantially equal to each other and perpendicular to said total length; and wherein substantially all of the studs inserted in the stud holes are orientated so that one of said diagonal dimensions of the hard pieces forms a toe-out angle that is smaller than 10° with respect to the rolling direction.