The ornamental design for an idlerwheelweight, as shown and described.
FIG. 1 is a side view of a drive track assembly with an idler wheel weight shown according to the present design;
FIG. 2 is a front, perspective view of the idler wheel weight;
FIG. 3. is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken line representations in the figures show unclaimed environment or boundaries. The broken line representations thus form no part of the claimed design as filed.