The drivetrain system transfers torque from the motor to the wheels. The drivetrain will be situated in the upright and consists of the motor, planetary gearbox and the hub, which the wheel connects to. The drivetrain needs to incorporate high efficiency and reliability, but also compact packaging. Close collaboration with uprights and suspension is necessary for packaging, and also with powertrain for power supply and cooling. The design job includes component design, FEA, extensive life time analysis and thermal analysis.