Kawasaki is well know for its Ninja sportbike lineup. The Ninja ZX-14 is the largest, a hypersportbike. The ZX-10R superbike and ZX-6R supersport are Kawisaki's road-racing platforms. Other Ninja models are more street-friendly, like the Ninja 650R and Ninja 500, as well as the manufacturer's best-selling model - the Ninja 250R, which corners the entry-level sportbike market in the US. History of Kawasaki Motorcycles