The ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view of a tire tread showing my new tread design,
it being understood that the tread pattern is repeated uniformly
throughout the circumference of the tire tread with the opposite side
being a mirror image of the side shown; and,
FIG. 2 is an enlarged fragmentary front elevation view of the tire tread
illustrated in FIG. 1.
The broken line showing of a tire sidewall and inner bead is for
illustrative purposes only and forms no part of the claimed design.