The KTM Duke is a widely popular line of sport motorcycles made by Austrian manufacturer KTM. The Duke series is powered by single-cylinder engines ranging in size from 125cc to 1290cc, and feature naked styling, lightweight chassis and advanced technology such as ride-by-wire throttle, traction control and ABS. The KTM Duke is one of the most popular street bikes in the world, with a cult-like following among enthusiasts.