The Kawasaki Z900 is a high-performance motorcycle and is often categorized as a sport or sport-naked bike. While it offers powerful performance and aggressive styling, it is not typically classified as a "superbike" in the strictest sense.
The term "superbike" is often used to describe motorcycles with extreme performance capabilities, usually with top-of-the-line components, cutting-edge technology, and track-focused design. Superbikes are typically characterized by their high horsepower, advanced aerodynamics, and aggressive riding positions.
While the Z900 offers impressive performance with its 900cc inline-four engine and sporty handling, it is generally considered to be in the middleweight or middle-class category of motorcycles. It strikes a balance between performance, comfort, and versatility, making it suitable for both spirited riding on the road and occasional track use.