List of motorized trikes is a list of motorized tricycles also called trikes, and sometimes considered cars. There are three typical configurations: motorized bicycle with sidecar; two wheels in the rear, one in the front (aka trike); and two in front, one in the rear (aka reverse trike). However, language and definitions vary. Trikes have caused tautological confusion and simply defied typical two and four-wheel classifications, especially in the 21st century. Regardless, many popular motorcycles and/or automobiles had three wheels.