A four bar drive link system simulator 10 has a frame assembly 11, a proximal hinge attachment bracket 20, a bottom bracket simulator 40, a pair of crank levers 31L, 31R, a pair of coupling levers 32 and a pair of pedal simulator levers 22L, 22R. The frame assembly 11 has a plurality of guide rails, including at least a proximal hinge adjustment rail 22, and a frame simulator rail 13. The proximal hinge attachment bracket 20 is connected to the proximal hinge adjustment rail 22. The bottom bracket simulator 40 is attached or otherwise connected to the frame simulator rail 13. The pair of crank levers 31L, 31R is each attached at a first end to an axle 42 having its axis of rotation in the bottom bracket simulator 40, one crank lever being on one side of the bottom bracket simulator 40, the other on the opposite side. The pair of coupling levers 32 is each attached to an opposite second end of the crank lever 31L or 31R. The pair of pedal simulator levers 22R, 22L is each pivotally attached to an end of the coupling lever 32 and to an axle 23 having an axis of rotation 50 at the proximal hinge attachment bracket 20. The relative dimensions between the axis of rotation of proximal hinge and axis of rotation of the bottom bracket 40 are adjustable by movement along the proximal hinge guide rail 22 or the frame simulator guide rail 13 or a combination of both.