An apparatus for use with a bicycle includes a base portion and a whistle portion. The base portion is attached to a frame, fender, or handlebars of a bicycle. The whistle portion is attached to the base portion and is adapted to produce an audible sound when the bicycle is moving forward. The sound that is produced can be disabled by rotating the whistle portion relative to the base portion or by urging a member so as to obstruct the flow of air through the whistle portion.
