JT SPROCKETS JTA822.53BLK : JT SPROCKETS Aluminium Ultra-Light Self-Cleaning Rear Sprocket 822 - 520 €35.10
D.I.D 485559 : DID/REN Chain Kit 520ERT3 14/50 Racing - Ultra-Light Self-Cleaning Rear Sprocket €140.92
AFAM : AFAM Chain kit 520XSR 16/46 Super-Reinforced - Ultra-light Hard anodized rear sprocket €185.24
AFAM 48011351 : AFAM Chain Kit 520XRR3 14/50 Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €154.04