The ornamental design for a pneumatictire tread and buttress, as shown and described.
FIG. 1 is a front elevation view of a pneumatic tire tread and buttress
showing my new design it being understood that the pattern is repeated
uniformily through the circumference of the tread and buttress; and,
FIG. 2 is a side elevational view of FIG. 1 both side views being the same.
The broken line showing of environmental structure is for illustrative
purposes only and forms no part of the claimed design.