## Rear Sprocket 520 43 Teeth JT Sprockets JTR857 The JT Sprockets JTR857 rear sprocket is a high-quality component for motorcycles and scooters, guaranteeing reliability and long service life. Made of C49 steel (High Carbon Steel), it is characterized by exceptional strength and resistance to wear, even under harsh operating conditions. ### Precision and Performance The JTR857 sprocket has 43 teeth, which translates into optimal gear ratio and smooth operation of the drive system. Precise manufacturing ensures a perfect fit for the 520 chain, minimizing energy loss and ensuring maximum efficiency. ### Fit and Installation The JTR857 sprocket is designed for easy installation. The diameter of the mounting bolt hole is 10.5mm, the center hole diameter is 125mm, and the bolt circle diameter is 145mm. These precise dimensions guarantee trouble-free installation and compatibility with many motorcycle and scooter models. ### JT Sprockets Quality JT Sprockets is a renowned manufacturer of motorcycle parts, known for the high quality of its products. The JTR857 sprocket is another example of the attention to detail and precision characteristic of this brand. By choosing JT Sprockets, you are investing in reliability and safety.