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 essentially the same as for 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 an inner bead and sidewall is for illustrative
purposes only and forms no part of the claimed design.