The ornamental design for a tire tread, as shown and described.
FIG. 1 is a front perspective view of a tire tread showing my new design,
it being understood that the tread pattern repeats uniformly throughout
the circumference of the tire tread, the opposite side perspective view
being identical thereto;
FIG. 2 is an enlarged fragmentary plan view of the tread pattern of FIG. 1
further showing my new design; and,
FIG. 3 is a perspective view of the fragmentary plan view of FIG. 2.
The broken line disclosure of a tire sidewall and inner bead is for
illustrative purposes only and forms no part of the claimed design.