The ornamental design for a tricycle, substantially as shown and described.
FIG. 1 is a left front perspective view of a tricycle showing my new
design;
FIG. 2 is a right rear perspective view thereof;
FIG. 3 is a fragmentary perspective view of a tricycle showing a second
embodiment of my new design, it being understood that the tricycle body
has been omitted for ease of illustration, wherein the only difference
resides in the handle bar structure; and
FIG. 4 is a fragmentary perspective view of a tricycle showing a third
embodiment of my new design, it being understood that the tricycle body
has been omitted for ease of illustration, wherein the only difference
resides in the handle bar structure.