A tandem bicycle comprising: a front wheel and a back wheel; a frame suspended between said front wheel and said back wheel, said frame including a front seat tube member and a back seat tube member located at predetermined positions thereon in relative proximity to said front and back wheels, the frame further comprising a top tube member,, and a down tube between a front end of said top tube member and a bottom end of said back seat tube member; a head tube member located at a front end of said tandem bicycle in mechanical communication with a handle bar and a steerable fork, said fork movably connected to said front wheel, wherein the handle bar is located at the front end of the tandem bicycle; a front seat and a rear seat removably and adjustably attached to said respective front and rear seat tube members (22', 22); a power transmission (46, 54) being adapted to be operable by a first and a second rider either individually or together, wherein the power transmission drives the back wheel, wherein the handle bar is movably connected to the head tube member of the frame and is adapted to be manipulated by either at least one of the first or second riders sitting on the front or back seat; wherein the power transmission comprises a first set of left and right pedals for the back seat located adjacent a bottom end of said back seat tube member; and a first distance (L 1) between the head tube member and front seat tube member is less than 35.6 cm (14 inches) and is less than 75% the length of a second distance between said rear seat tube member and said front seat tube member; characterised in that a second set of left and right pedals for the front seat located at a bottom end of a front seat tube member downward extension tube which extends below the down tube. a front wheel and a back wheel; a frame suspended between said front wheel and said back wheel, said frame including a front seat tube member and a back seat tube member located at predetermined positions thereon in relative proximity to said front and back wheels, the frame further comprising a top tube member,, and a down tube between a front end of said top tube member and a bottom end of said back seat tube member; a head tube member located at a front end of said tandem bicycle in mechanical communication with a handle bar and a steerable fork, said fork movably connected to said front wheel, wherein the handle bar is located at the front end of the tandem bicycle; a front seat and a rear seat removably and adjustably attached to said respective front and rear seat tube members (22', 22); a power transmission (46, 54) being adapted to be operable by a first and a second rider either individually or together, wherein the power transmission drives the back wheel, wherein the handle bar is movably connected to the head tube member of the frame and is adapted to be manipulated by either at least one of the first or second riders sitting on the front or back seat; wherein the power transmission comprises a first set of left and right pedals for the back seat located adjacent a bottom end of said back seat tube member; and a first distance (L 1) between the head tube member and front seat tube member is less than 35.6 cm (14 inches) and is less than 75% the length of a second distance between said rear seat tube member and said front seat tube member; characterised in that a second set of left and right pedals for the front seat located at a bottom end of a front seat tube member downward extension tube which extends below the down tube.