The doors of the new Peugeot 406 coupe are the longest on any European production car. They measure 1.3 meters front-to-rear.
The frameless door required construction techniques developed by Pininfarina in 1990. Fully equipped, the 406 door weighs 37kg. The load is taken by reinforced hinges backed by 1.8mm strengthening plates.
A special molding process ensures the window glass - which itself weighs 6.2kg - is free of peripheral distortion.
The window's movement is controlled by a Bosch electric motor supplying 12Nm torque. The glass moves down 10mm to clear the draft seal when the door is opened, and rises that distance again to provide a good seal after the door is shut.
Each time, the computer controlling the process tells the motors exactly how many revolutions to complete. Inspection holes behind the side molding allow service personnel to adjust the glass without the need to dismantle the door.