Abstract: The invention provides a bicycle shield device adapted to be removably connected to a bicycle attached to a carrier for transportation by a highway vehicle so that the shield device is interposed in the airstream immediately ahead of the bicycle, in order to shield the bicycle from impact by foreign objects during such transportation. The device of the invention generally comprises an elongate narrow body to shield the bicycle frame and frame-mounted components, and a pair of opposed arms extending outwardly from the body in generally perpendicular relation to shield the bicycle handlebars and handlebar-mounted components. Various embodiments and adaptations for accommodation of different bicycle-to-carrier attachment systems are also disclosed.