The ornamental design for an AT tire, as shown and described.
FIG. 1 is a perspective view of the AT tire;
FIG. 2 is a front elevation view of the AT tire;
FIG. 3 is side plan view of the AT tire;
FIG. 4 is a partial top plan view of the AT tire; and,
FIG. 5 is an enlarged perspective view of the AT tire.
The broken line in the drawings depict environmental subject matter and no part of the claim. The broken line in FIGS. 2 and 5 are for demarcation of enlarged portions of the AT tire and forms no part of the claimed design.