Tire tread wear indicator

FIG. 1 is a fragmentary perspective view of a tire tread wear indicator showing our new design;

FIG. 2 is an enlarged fragmentary perspective view from the circled area shown in FIG. 1 ;

FIG. 3 is an enlarged partial front elevational view thereof from the circled area shown in FIG. 1 ; and,

FIG. 4 is a cross-sectional view taken along line 4 - 4 of FIG. 3 .

In the drawings, the broken lines showing of a tire depict environmental subject matter and form no part of the claimed design.