The ornamental design for a wheel, as shown and described.
FIG. 1 is a perspective view of a wheel showing our new design;
FIG. 2 is a front elevational view thereof; the rear elevational view is a
mirror image of the front elevational view; and,
FIG. 3 is a right side elevational view thereof; the left side elevational
view, the top plan view and the bottom plan view are similar to the right
side elevational view.