Patent ID: 7204281

Claim:
A studless tire comprising: a tread portion provided with two circumferential portions, one on each side of the tire equator, whose total width is in a range of from 10 to 25% of the tread width, and circumferential rows of blocks circumferentially separated by axial grooves, wherein each of said circumferential portions is provided with V-shaped sipes each composed of two parts extending from a vertex located in a central region of the circumferential portion, wherein the V-shaped sipes in each said circumferential portion are oriented towards the same direction and arranged at intervals in the tire circumferential direction, and in each said circumferential portion, the V-shaped sipes each extend across the overall width of the circumferential portion to have open ends, and except for said V-shaped sipes there is no groove extending across the overall width of the circumferential portion, and the vertexes of the V-shaped sipes are disposed off the center line of the circumferential portion in the tire axial direction, wherein the axial distance between each of said vertex and center line is in a range of not more than 30% of the axial width of the circumferential portion, and said vertexes are staggered about the center line.