The most distinctive feature of the new ROTWILD hybrid-mountain-bikes isthe Integrated Power Unit (IPU), which uses the battery pack as a constructive element of the carbon bottom tube. The IPU also allows for greater stiffness and less weight. The new Brose drive system is 100% decoupled, preventing it from generating additional resistance above the legal speed limit. Therefore, it is easy to pedal even at speeds above 25 km/h.