The invention is a bicycle rider fitting machine. It is used for finding optimal position of the rider on future bicycle/frame, based on parameters obtained during the workouts. Based on workout results like heart rate, power, speed, cadence, etc., what can be measured by integrated or independent electronic measuring devices, someone can compare those results and conclude the best possible positions of saddle and handlebars for particular rider.It is an apparatus that can simulate almost any position of the bicycle saddle and handlebar assembly with the reference to the Bottom Bracket centre (FIG. 1-4) as a starting 0/0 position. The saddle (FIG. 1-1) and handle bar assembly (FIG. 1-2) can be moved independently with respect to the bottom bracket. The obtained position of the saddle and handlebar position can be easily recorded for future adjustments of the machine, by means of Horizontal (X) Scales (FIG. 1-3) on the Seat Slider (FIG. 1-5) and Handlebar Slider (FIG. 1-6) and by means of Vertical (Y) scale (FIG. 1-7) on the Seat Tube (FIG. 1-8) and Handlebar Tube (FIG. 1-9) vertical scale (FIG. 1-10). The obtained measurements are of use in the design and fit of a bicycle to a particular individual.