The Sachs MadAss is an 125 cc (7.6 cu in) underbone motorcycle made by German automotive company Sachs Motorcycles since 2004. The engine is based on the popular horizontal one cylinder originally used in Honda mopeds and small motorcycles from the late 1960s.
It incorporates the fuel tank into the frame and has no external bodywork or fairings. It has a stainless steel under-seat exhaust, a four-speed manual gearbox and dual hydraulic disc brake. The front headlights are positioned vertically.