FIG. 1 is a perspective view of the tire tread showing a first embodiment of my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is an enlarged plan view of a portion thereof;
FIG. 7 is a sectional view taken along line 7-7 in FIG. 6;
FIG. 8 is a sectional view taken along line 8-8 in FIG. 6;
FIG. 9 is a sectional view taken along line 9-9 in FIG. 6.
FIG. 10 is a perspective view of the tire tread showing a second embodiment of my new design;
FIG. 11 is a front view thereof;
FIG. 12 is a right side view thereof;
FIG. 13 is a rear view thereof;
FIG. 14 is a left side view thereof;
FIG. 15 is an enlarged plan view of a portion thereof;
FIG. 16 is a sectional view taken along line 16-16 in FIG. 15;
FIG. 17 is a sectional view taken along line 17-17 in FIG. 15;
FIG. 18 is a sectional view taken along line 18-18 in FIG. 15.
FIG. 19 is a perspective view of the tire tread showing a third embodiment of my new design;
FIG. 20 is a front view thereof;
FIG. 21 is a right side view thereof;
FIG. 22 is a rear view thereof;
FIG. 23 is a left side view thereof;
FIG. 24 is an enlarged plan view of a portion thereof;
FIG. 25 is a sectional view taken along line 25-25 in FIG. 24;
FIG. 26 is a sectional view taken along line 26-26 in FIG. 24; and,
FIG. 27 is a sectional view taken along line 27-27 in FIG. 24.
The broken lines are used to show portions of an environmental tire that are not being claimed, and thus form no part of the claimed design.