Patent ID: 7334619

Claim:
A pneumatic tire having blocks which are divided by tread grooves and which include a plurality of sipeings provided side-by-side, wherein each of said sipeings has: an opening which opens at a block surface and has a zigzag portion which extends in a zigzag form while repeating mountains and valleys, and sipeing wall surfaces which face each other on both sides of sipeing and which comprise one zigzag displacement portion where the zigzag portion is displaced toward one end of a longitudinal direction of the sipeing and another zigzag displacement portion where the zigzag portion is displaced toward the other end of the longitudinal direction, said one zigzag displacement portion and said another zigzag displacement portion are alternately repeated in a depth direction of the sipeing while substantially maintaining the shape of said zigzag portion, and wherein the following formulas are satisfied: W1≧W2, and 0.7 ×W 2 ≧W 3>0 wherein W 1 , W 2 and W 3 are displacement amounts in a vertical plane which passes through a projection end of the zigzag in the block surface, and intersects perpendicularly with a longitudinal direction of the opening, W 1 , W 2 and W 3 are displacement amounts measured in parallel to the block surface, W 1 is the displacement amount of the upper zigzag displacement portion, W 3 is the displacement amount of the bottom zigzag displacement portion, and W 2 is the displacement amount of the middle zigzag displacement portion located therebetween, and wherein the following formulas are further satisfied: L1≧L2, and 0.7 ×L 2 ≧L 3>0 wherein L 1 , L 2 and L 3 are displacement amounts in the longitudinal direction of the zigzag portion, L 1 is the displacement amount of the upper zigzag displacement portion, L 3 is the displacement amount of the bottom zigzag displacement portion, and L 2 is the displacement amount of the middle zigzag displacement portion located therebetween.