JT Sprockets 530 Steel Rear Sprocket Yamaha R1 / LE JT Sprockets crafts its steel sprockets with precision, utilizing the newest technology in computer design and metal cutting equipment. This meticulous process ensures both maximum durability and weight savings, offering a high-quality upgrade for your machine. Features: 530 pitch JT steel rear sprockets are made from C49 high carbon steel Heat-treated and bead blasted to reduce material surface tension