D.I.D : DID/PBR Chain Kit 420D 14/51 (No OEM Ratio) Standard - Aluminium Ultra-Light Rear Sprocket €55.86
D.I.D : DID/PBR Chain Kit 520ERT3 13/50 Super-Reinforced - Ultra-Light Self-Cleaning Hard Anodized Rear Sprocket €120.72
AFAM 3038930 : AFAM Chain Kit 520MX6 13/48 Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €139.26