The Sachs MadAss is an underbone motorcycle available in a 49 cc (3.0 cu in), 125 cc (7.6 cu in) or160 cc (9.8 cu in) assembled in Malaysia and manufactured in China and distributed 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. The MadAss has been sold in the US as the Xkeleton Trickster, and under the Pierspeed and Tomberlin brands as the MadAss. In Canada, it was also sold as the AMG Nitro.