 An underbone motorcycle may share its fuel tank position and tube framing, along with fitted bodywork and splash guards with a scooter while the wheel dimensions, engine layouts, and power transmission are similar with conventional motorcycles.Unlike motor scooters, underbones are mostly popular in Asia, particularly in Southeast Asia, Middle East, Taiwan, China and North Korea, in Latin America, as well as in some parts of Eastern Europe, Greece and Russia.The appearance and frame of an underbone is quite different from that of a standard motorcycle, but the powertrain is functionally almost identical.