Retul 3D Fit

Retül uses a 3D motion capture system that reads a rider's movements while he or she is pedaling on the bike, and records all three planes of movement (3D). This type of data reflects how a rider actually rides a bike and cannot accurately be captured with 2D video or static fitting. Retül's dynamic fit tools allow a bike fitter to make fast and easy adjustments to a rider's position using objective and highly accurate fit data to guide the changes.

Dynamic fitting

  • Dynamic fitting is the most realistic. Using motion capture technology, Retül records a rider’s position while he or she is in motion to create the most realistic picture of the rider’s actual pedal strokes and body positions when out on the road and trails. Riding a bike is different than sitting on a bike, and capturing data dynamically presents a clearer and more accurate picture of a rider’s movements.

Measurement accuracy

  • Measurement accuracy is vital. Slight inaccuracies (the difference of millimeters) can drastically change a rider’s feel after a ride. The Retül system is accurate to within less than a millimeter, creating true objective data which can be utilized by the fitter for the perfect biomechanical fit. Small adjustments can make a big difference in alleviating back, knee or neck pain, and those adjustments will improve a rider’s performance.


  • Biomechanics are best assessed in 3D space in order to see how all of the applicable movements of the body are working together, the frontal and sagittal planes of a rider should be viewed as interdependent reference points. Retül’s motion sensors simultaneously gather data on multiple angles of the rider in three dimensions so a fitter can not only see measurements such as knee and hip angles, but also lateral knee tracking and hip lateral travel.


  • Efficiency is best for the fitter and the rider. As a fitter gains more experience with the Retül system, he or she will have greater efficiency and time savings compared with other methods of fitting. This allows the fitter to focus on his or her client and make the proper recommendations for each individual and personalized situation. The Retül system is designed to provide great utility to the fitter by providing comprehensive and accurate data. This creates an interactive experience for the rider in which data and fit changes can be discussed openly during the fit.

Retul 3d Dynamic Bicycle Fitting Cost $350

A full 3D fit will take from 2.5 to 3.5 hours.


Included with the fit. 

    Biomechanical analysis.
    Cycling-specific flexibility/functional strength assessment.
    Dynamic data capture of 3D full body movements to determine optimal position.
    Real-time recording of power output and physiologic response to help determine optimal position.
    Comprehensive digital reports of 3D and 2D body parameters, 3D bicycle fit coordinates, and bike frame geometry.
    An additional bicycle is priced at $175 when bikes are fit consecutively (for example road and mountain bikes fit back to back).