HOW THE RETÜL SYSTEM WORKS
Retül bike fit technology incorporates three main data points in fit theory: 

Bike fits must be dynamic
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:
The Retül system is accurate to within less than a millimetre, creating true objective data which can be utilised by the fitter for the perfect biomechanical fit.

Biomechanics are best assessed in Three-Dimensional space:
In order to make the best fit recommendations, the fitter must realise 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.