The BMW K100 is a motorcycle produced by the German manufacturer BMW from 1983 to 1992. It features a 987cc inline-four engine, known for its smooth performance and reliability. The K100 was one of the first motorcycles to use a liquid-cooled engine, which contributed to its efficiency and longevity. This model is often recognized for its unique design, including a distinctive "flying brick" shape due to its flat engine layout. The K100 was available in various versions, including the K100RS, which offered a sportier riding experience. It remains a popular choice among vintage motorcycle enthusiasts.