One definition, L'EROICA*REGULATION

"L’Eroica" bicycles are bicycles which have all the following characteristics:
road racing bikes, built before 1987 (not cycle-cross or time trial bikes);
steel frame (the only aluminium frame bikes permitted are ALAN or VITUS with either screwed or glued joints);
gear shift levers on the down tube of the frame (exceptionally, only pre-1980 bar-end gear shifts are allowed);
pedals with toe clips and fitted straps (quick release pedals are not allowed, except Cinelli M71 pedals);
passage of brake cables outside the handlebars (the passage of cables inside the frame is acceptable);
wheels must have at least 32 spokes with a low profile (less than 20 mm).