The term 'Bicycle Built for Two' refers to a type of bicycle designed for two people to ride at the same time. It is also known as a TANDEM bicycle. The crossword solutions for this term are TANDEM (6 letters), TIRES (5 letters), and AERO (4 letters). TANDEM refers to the type of bicycle, while TIRES and aero refer to the components of the bicycle. TIRES provide traction and cushioning, while aero refers to the aerodynamic shape of the frame.