an accessory for bicycles or tricycles for producing a motorcycle - like sound appealing to youngsters . the device being constructed of a strip of relatively hard but flexible material formed into a shape having : a flat region engaging the spokes of the bicycle wheel ; an &# 34 ; s &# 34 ; shaped region providing flexibility thereby allowing the flat region to move as the spokes impinge on it ; a semi - tubular region lined with a hook type fastener material for attaching to a fork element of the bicycle ; and a handle as an aid for spreading apart the semi - tubular region to attach the accessory to the fork element .