UCI CYCLING REGULATIONS  A protective screen shall be defined as a fixed component that serves as a windscreen  or windbreak designed to protect another fixed element of the bicycle in order to reduce  its wind resistance.  A fuselage form shall be defined as an extension or streamlining of a section. This shall  be tolerated as long as the ratio between the length L and the diameter D does not  exceed 3. This rule does not apply to frame and fork of the bicycle.  E0221  GENERAL ORGANISATION OF CYCLING AS A SPORT  69 