the technology

Retül technology is a cycling-specific motion-capture bike fitting system designed to provide qualified bike fitters highly accurate and comprehensive bike fit data. The system incorporates three-dimensional measurement, immediate report capability, and a millimetre-specific digitizing tool to provide the most accurate dynamic fitting solution in the industry.

The goal of Retül using technology is to make your bike fit as objective and accurate as possible. A proper bike fit is one of the single most important factors for optimal performance and efficiency, injury prevention, and comfort on the bike. A proper bike fit will not only provide a rider with the most economic means of expending energy, but will also prevent pain that is common in the knee, hip, and lower back, particularly if you are one of the many riders who is trying to adapt their bodies to the bike they already have purchased.

The Retül system reads the movements of your body while you are on your bike and are also in motion, and in doing so accounts for all three planes of movement (3D). This type of data cannot accurately be captured with 2D video, static fitting, or eyeball fitting. The Retül system eliminates the guesswork and assumptive nature of bike fit. The result is that, you, the rider will have a true fit to your bike, with the aim of maximizing the efficiency of your performance while aiming to avoid discomfort or injury.

Screen Shot Poses
Elite athletes and recreational cyclists alike will benefit from a proper bike fit. The use of Retül promotes and encourages accurate and data-driven decisions for your bike fit while considering your goals, individual biomechanics, strengths, and limitations.

Retül bike fit technology incorporates three main data points in fit theory:

Bike fits must be dynamic
Most bike fitting specialists fit riders in a static position. This is because the traditional tools of the trade – tape measures and plumb bobs – do not allow accurate measurements while the rider is pedaling. Using motion capture technology, Retül records the rider’s positions in motion, therefore creating the most realistic picture of the rider’s actual pedal strokes and body positions when out on the road and trails.

Measurements must be accurate
Measurements made by traditional tools have one thing in common. They are subject to human error and therefore can be devastatingly inaccurate. Even slight inaccuracies can drastically change the rider’s feel after a ride. The Retül system is accurate to within less than a millimetre, creating true objective data which can be utilized by the fitter for the perfect biomechanical fit.

Biomechanics are best assessed in three-dimensional space
Fit data collected in a traditional two-dimensional plane (i.e. video-based systems) is fairly limited because the fitter can only look at one view at a time, and those views stand as independent reference points. In order to make the best fit recommendations, the fitter must realize that the front and side views are actually interdependent reference points. In other words, the front and side views must be viewed simultaneously in three dimensions in order to see how all the applicable movements of the body are working together. Retül uses a 3D motion sensor to simultaneously gather data on multiple angles of the rider.

How does Retül improve or complement other fitting systems?

Retül does not replace qualified fitting technicians. Retül allows the fitter to see data that he or she could not see with a standard fitting system, giving the fitter necessary information to best serve the client and provide the most accurate fit information possible. The fitter still has to understand the core aspects of anatomy and cycling to truly maximize the capabilities of Retül. The Retül system can be used alongside any sizing or measuring system, as well as video analysis.

However, data from the Retül system:

  • Provides measurement accuracy and repeatability, rather than using measurements subject to inaccuracy and human error.
  • Views the rider in three dimensions rather than two, giving the fitter a broader snapshot of the rider’s biomechanics on the bike.
  • Allows the fitter to analyze a data set of averaged pedal strokes from the rider, rather than relying on a single frame of video.
  • Calculates data reports within a matter of seconds, eliminating manual post-processing, and reports can be archived for future reference.

How does Retül compare to video analysis?

  • Video analysis is two-dimensional, while motion capture is three-dimensional. A small error is added to measurements by not including all three dimensions in the calculation process. Small errors make big differences in bike fit.
  • Video cameras have a narrow field of view. Retül sensors have a wide field of view. This means that the video camera must be one to two meters further away from the rider to capture the full view of the rider.
  • Video analysis places measurement markers on a small 2D computer screen. Retül places measurement markers on the rider’s body using easy to find skeletal landmarks.
  • Video analysis requires that you manually trace each measurement after recorded with your mouse. Retül automatically performs all the measurements instantly with no manual work.
  • Video analysis takes measurements from one frame of video, which may or may not be a typical position of the rider. Retül automatically averages the measurements from each pedal stroke, creating a highly refined model of the average movements of the rider.

Comments are closed.