## Sprocket 19 / 51 Teeth for Rear Transmission 139QMB/QMA (GY6 50) 4T This high-quality transmission component, the 19/51 tooth sprocket, is designed for 139QMB/QMA (GY6 50) 4T engines, commonly used in scooters. Engineered with precision, it ensures smooth and efficient operation of the rear transmission. ### Precision and Durability The sprocket features 51 teeth and 19 cutters, guaranteeing optimal gear ratio and smooth power transfer. Made from durable materials, it is resistant to wear and tear and ensures long-lasting performance, even under demanding conditions. ### Compatibility and Application It perfectly fits the popular 139QMB/QMA (GY6 50) 4T engines found in many scooter models. Replacing the sprocket is a simple way to improve performance and riding comfort. ### Key Benefits: * Precise manufacturing for optimal gear ratio * Durable construction resistant to wear and tear * Compatibility with 139QMB/QMA (GY6 50) 4T engines * Easy installation * Improved scooter performance