The ornamental design for tire tread, as shown and described.
FIG. 1 is an isometric view, partially schematic, of a tire tread showing
my new design, it being understood that the tread pattern repeats
uniformly throughout the circumference of the tire tread, as indicated
schematically in solid lines, and the opposite side being substantially
the same as that shown; and,
FIG. 2 is an enlarged partial developed plan view thereof.
The broken line showing of the tire inner bead is for illustrative purposes
only and forms no part of the claimed design.