The simulation engine has been introduced in our Android and iOS indoor training apps in Winter 2015. It's the default mode now but it's optional for many equipment. When using this mode, the calculations are the same for all kind of equipment, as long as they provide the Watts produced. It is based on the user weight, the frontal area of his body, the aerodynamism of his bike, and most important on his previous speed (kinetic speed). It allows to operate a fair comparison between the performances produced from different models of fitness/cycling equipment, not relying on the manufacturer's engine.
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