The ornamental design for a longboardwheel, as shown and described.
FIG. 1 is an upper perspective view of a longboard wheel, illustrating the wheel attached to an exemplary longboard;
FIG. 2 is an upper perspective view of the longboard wheel;
FIG. 3 is a front view of the longboard wheel;
FIG. 4 is a rear view of the longboard wheel;
FIG. 5 is a left side view of the longboard wheel; and,
FIG. 6 is a right side view of the longboard wheel.
The broken lines shown in the figures are included for the purpose of illustrating the environment in which the article resides and forms no part of the claimed design.