The NSU Trapeze was designed by Bertone and first displayed at the Paris Motor Show in October 1973. The car featured a mid-mounted NSU RO80 engine, positioned length-ways with rotating piston. The seats were laid out in a trapezium formation. The rear passenger seats were out of line with the front seats, which enhanced Driver's visibility. The design resembles the Lancia Stratos, with its wrap-around windscreen and small side windows.

