AFAM 3038980 : AFAM Chain Kit 520MX6 13/49 Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €140.41
D.I.D 48011370 : DID/PBR Chain Kit 520ERT3 14/50 Super-Reinforced - Ultra-Light Rear Sprocket €106.72
D.I.D : DID/PBR Chain Kit 520DZ2 12/51 Reinforced - Ultra-Light Self-Cleaning Hard Anodized Rear Sprocket €102.22
AFAM 48010838 : AFAM Chain Kit 520XRR3 13/51 Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €156.12
RENTHAL 1500-520-48GPBU : RENTHAL Twinring Aluminium Ultra-Light Self-Cleaning Hard Anodized Rear Sprocket 1500 - 520 €157.78