Patent ID: 8757229

Claim:
A vehicle wheel tire comprising: a tire tread having a circumferential center tread region comprising a plurality of block elements arranged in a pattern on opposite sides of a tire circumferential equatorial centerplane, wherein the tread having a repeating circumferential array of first substantially V-shaped grooves positioned on the centerplane, each first V-shaped groove having divergent first groove side arms extending in a first circumferential direction, and the tread having a repeating circumferential array of second substantially V-shaped grooves positioned on the centerplane and having divergent second groove side arms extending in a second circumferential direction opposite to the first circumferential direction; each first V-shaped groove being overlapped by a plurality of second V-shaped grooves; wherein the first V-shaped groove arms each have a varying lengthwise depth; and wherein the groove depth of each first V-shaped groove varies from a shallower depth proximate to a vertex arm region to an increased depth at a medial arm region to a decreased depth at a terminal arm region.