The ornamental design for a tire tread and buttress, as shown and described.
FIG. 1 is a front elevational view of a tire tread and buttress, it being
understood that the pattern is repeated throughout the circumference of
the tread and buttress as shown schematically by solid lines; and
FIG. 2 is a perspective view thereof, it being understood that the broken
line showing of the tire sidewall and bead portions are for illustrative
purposes only.