Minibike

Two-wheeled, motorized, off-highway recreational vehicle

A minibike is a two-wheeled, motorized, off-highway recreational vehicle popularized in the 1960s and 1970s, but available continuously from a wide variety of manufacturers since 1959. Their off-highway nature and (in many countries) typically entirely off-road legal status differentiate minibikes from motorcycles and mopeds, and their miniature size differentiates them from dirt bikes. Traditionally, minibikes have a four-stroke, horizontal crankshaft engine, single- or two-speed centrifugal clutch transmissions with chain final-drive, 100 or 150 mm (4 or 6 in) wheels and a low frame/seat height with elevated handlebars.

From Wikipedia, under CC BY-SA. More on occurri.