The ornamental design for a steeringwheel for a vehicle, as shown and described.
FIG. 1 is a perspective view of top, front, and right side of a steering wheel for a vehicle;
FIG. 2 is a front view thereof;
FIG. 3 is a right side view thereof, the left side view being a mirror image of FIG. 3;
FIG. 4 is a top plan view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a perspective view of bottom, rear and right side thereof.
The claimed design is indicated by the relatively dark portions in the figures, while the relatively light portions surrounded by broken lines form no part of the claimed design.