The ornamental design for a tire tread, as shown and described.
FIG. 1 is a perspective view of a tire tread showing my new design, it
being understood that the tread pattern is repeated uniformly throughout
the circumference of the tire;
FIG. 2 is a front elevational view thereof; and,
FIG. 3 is a side elevational view thereof on a reduced scale.
The broken line showing of the tire sidewall in the drawings is for
illustrative purposes only and forms no part of the claimed design.