The ornamental design for 4 wheeled bike, as shown and described.
FIG. 1 is the front elevational view of 4 wheeled bike;
FIG. 2 is the rear elevational view thereof;
FIG. 3 is the left side view thereof;
FIG. 4 is the right side view thereof;
FIG. 5 is the top plan view thereof;
FIG. 6 is the bottom plan view thereof;
FIG. 7 is a front perspective view thereof; and,
FIG. 8 is a rear perspective view.
The grey rectangle in the background of the drawing is just for the purpose of showing the design of the “4 wheeled bike” more clearly. It is understood that it is not a part of the design.