UCI CYCLING REGULATIONS  Chapter XV TANDEM BICYCLE  Definition  16.15.001  The tandem is a vehicle for two cyclists, with two wheels of equal diameter, which  conforms to the general principles of UCI construction for bicycles. The front wheel shall  be steerable by the front rider, known as the «pilot». Both riders shall face forward in the  traditional cycling position and the rear wheel shall be driven by both cyclists through a  system comprising pedals and chains.  16.15.002  The tandem top tube and any additional strengthening tubes, may slope to suit the  morphological sizes of the riders.  16.15.003  [article abrogated on 01.02.17] E0121  PARA-CYCLING  70 