For the purpose of this chapter, the following definition shall apply unless the context clearly indicates or requires a different meaning.
BICYCLE. Any device upon which a person may ride, which is propelled by human power through a system of belts, chains or gears having either two or three wheels (one of which is at least 20 inches in diameter) or having a frame size of at least 14 inches, or having four or more wheels.
('81 Code, § 10.40.010)