The force placed on the pedals is transmitted to the bike through the crank shaft, this is connected with the chain and to the cassette mounted on the rear wheel that moves the motor and magically the bike picks up speed. From here it is easy to understand the importance of the rigidity of this component and to avoid loosing precious watts produced solely by our legs. According to your biometric measurements and the capabilities of each rider you can opt for the model and the correct crank length that allows to fully exploit the available energy, not to mention the aesthetic aspect, which is always important in cycling.