The ornamental design for a set of sportsboardracks, as shown and described.
FIG. 1 is a perspective view of a set of sports board racks showing my new design;
FIG. 2 is a left side view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a top view thereof;
FIG. 6 is a front view thereof;
FIG. 7 is a back view thereof; and,
FIG. 8 is a perspective view of the set of sports board racks in use holding a sports board shown in broken lines.
The broken lines are for illustrating environment and form no part of the claimed design. The set of sports board racks is fabricated of transparent material.