Pneumatic tire with tread having zigzag sipes

A pneumatic tire comprising

• a tread portion provided with sipes,
• the sipes each having a zigzag configuration at any depth from the top of the sipe to a certain depth,
• the zigzag configuration having vertexes Q1 on one side of the zigzag and vertexes Q2 on the other side of the zigzag defining a center line with respect to the peak-to-peak zigzag amplitude of the zigzag configuration, wherein
• as the depth increases from the top of the sipe to said certain depth,
• the vertexes Q1 shift in the longitudinal direction of the sipe and the direction of the shift is turned at least once such that the vertexes Q1 first shift towards one direction then towards the other direction, thereby describing a zigzag line extending from the top of the sipe to said certain depth and having at least one turning point, and
• the vertexes Q2 shift toward one direction without turning the direction of the shift, and each vertex Q2 describes a straight line extending from the top of the sipe to said certain depth,
• said center line defines a center plane, wherein
• the vertexes Q1 are on a plane on one side of the center plane and parallel to the center plane, and
• the vertexes Q2 are on a plane on the other side of the center plane and parallel to the center plane.

A pneumatic tire comprising

• a tread portion provided with sipes,
• the sipes each having a zigzag configuration at any depth from the top of the sipe to a certain depth,
• the zigzag configuration having vertexes Q1 on one side of the zigzag and vertexes Q2 on the other side of the zigzag defining a center line with respect to the peak-to-peak zigzag amplitude of the zigzag configuration, wherein
• as the depth increases from the top of the sipe to said certain depth,
• the vertexes Q1 shift in the longitudinal direction of the sipe and the direction of the shift is turned at least once such that the vertexes Q1 first shift towards one direction then towards the other direction, thereby describing a zigzag line extending from the top of the sipe to said certain depth and having at least one turning point, and
• the vertexes Q2 shift toward one direction without turning the direction of the shift, and each vertex Q2 describes a slightly curved line extending from the top of the sipe to said certain depth,
• said center line defines a center plane, wherein
• the vertexes Q1 are on a plane on one side of the center plane and parallel to the center plane, and
• the vertexes Q2 are on a plane on the other side of the center plane and parallel to the center plane.