Abstract: An improved bubble generator. A bubble ring supported centrally in an air tube is wet by a bubble forming liquid flowing from the hollow interior of the ring through holes of approximately 0.031 inches in diameter. Mounting means attach the bubble generator to a bicycle, motion of which provides an air flow through an air tube which generates the bubbles. The generation of bubbles is controlled by movement of a priming pad into and out of engagement with the bubble ring. The movement of the pad is effected by an arm, on one end of which the pad is mounted and the other end of which is attached to a pivot. A rigid lever means actuates the movement of the arm about the pivot. The pivot comprises a plate attached to the under side of the air tube and having an arcuate identation, a yoke which fits over the pivot plate and an axle which is fixed across the yoke and rotates in the arcuate indentation.