The ornamental design for a wheelrim, as shown and described.
FIG. 1 is a front left perspective view of the wheel rim.
FIG. 2 is a front right perspective view thereof.
FIG. 3 is a front elevation view thereof.
FIG. 4 is a left side elevation view thereof.
FIG. 5 is a right side elevation view thereof.
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The dash-dash lines in FIGS. 1-7 are for illustrative purposes only, represent environmental subject matter, and form no part of the claimed ornamental design. There is no claim to surfaces that are not shown.