Tire tread having three different sipe types

A pneumatic having an inner shoulder, an outer shoulder and a tread therebetween, the tread comprising:

• a plurality of circumferential grooves dividing the tread into a plurality of ribs including inner and outer shoulder ribs, inner and outer intermediate ribs between the shoulder ribs and a central rib between the intermediate ribs,
• first sipes, each having an interlocking shape, in the shoulder ribs and the central rib,
• second sipes, each having a shape different from that of the first sipes, in the intermediate ribs, and
• third sipes, each having a shape different from that of the first and second sipes, in the intermediate ribs,
• wherein the interlocking shape of each first sipe is a generally sinusoidal shape,
• wherein each second sipe is one of generally S-shape or generally Z-shape,
• wherein each third sipe is of generally arc-shape, and
• wherein in each tread block of each intermediate rib, a second sipe is disposed between a pair of third sipes.

A pneumatic tire having an inner shoulder, an outer shoulder and a tread therebetween, the tread comprising:

• a plurality of circumferential grooves dividing the tread into a plurality of ribs including inner and outer shoulder ribs, inner and outer intermediate ribs between the shoulder ribs and a central rib between the intermediate ribs,
• first sipes, each having a generally sinusoidal shape, in the shoulder ribs and the central rib,
• second sipes, each having one of generally S-shape or Z-shape, in the intermediate ribs, and
• third sipes in the intermediate ribs, each third sipe having a generally arc shape and being generally adjacent to a second sipe.