Sunstar Inc. is a Japanese manufacturer known worldwide for producing high‑quality motorcycle drivetrain components, particularly sprockets, drive chains, and chain kits. With decades of experience rooted in precision engineering and motorsports, Sunstar parts are renowned for durability, dimensional accuracy, and consistent performance under the demanding conditions of street riding, off‑road, and racing environments. The company supplies both OEM and aftermarket components across a wide range of motorcycle makes and models, making Sunstar a trusted name for riders, mechanics, and performance builders alike.