Low noise pneumatic tire tread with voids balanced over each half tread region

A pneumatic tire with a tread for engaging a road surface at a footprint having non-linear leading and trailing edges, the tread comprising a plurality of repeating design cycles placed continuously about the circumference of said tire, each said design cycle including a respective portion of a plurality of circumferential rows of tread block elements and transverse grooves defining the shape of said tread block elements, each of said grooves commencing on a projection of one of the leading and trailing edges at which a corresponding other one of said grooves of substantially equal width terminates, such that the void across said one of the leading and trailing edges is substantially balanced about the circumference of said tire, and wherein at least one of said grooves in each design cycle and its corresponding groove are located respectively in different said circumferential rows of tread block elements, and wherein the void across said one of the leading and trailing edges over each half arc of the tread is substantially balanced about the circumference of said tire.