Abstract: A noise-producing accessory for a bicycle includes a body member having a flexible flap section at one end thereof. The body member is mounted to the bicycle frame such that the flexible flap section can be positioned into frictional contact with the external diameter of a bicycle tire to produce a realistic moto-cross type sound as the tire rotates. Preferably, at least a portion of a facing surface of the accessory is reflective such that the accessory can be used both as the standard rear reflector of a bicycle and a motocross sound generator. Preferably, the accessory can assume a variety of different shapes.