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IPU - transmission ratio of the Brose engine

The power from the Brose electric motor is transmitted in two stages in a ratio of 1:27. In the first stage, a planetary gear with a transmission ratio of 1:9 is connected before the motor while transmission in the second stage takes place in a ratio of 1:3 via a belt drive. This transmission ratio is necessary so that the electric motor (driven by the rider’s relatively low pedalling frequency) always rotates within its optimum speed window in order to guarantee a high efficiency.  

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