The ornamental design for wheelchair handgrip, as shown and described.
FIG. 1 is a top perspective view of a wheelchair handgrip according to our new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a rear elevation view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The evenly spaced broken lines in the Figures illustrate portions of the wheelchair handgrip that form no part of the claimed design. The dash-dot broken lines in the Figures between the solid line portions and the evenly spaced broken line portions of the wheelchair handgrip show the boundaries of the claimed design and form no part of the claimed design.