D.I.D : DID/PBR Chain Kit 420D 12/51 (No OEM Ratio) Standard - Aluminium Ultra-Light Rear Sprocket €56.10
AFAM 3038562 : AFAM Chain Kit 520MX6 13/51 Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €141.67
AFAM : AFAM Chain kit 520XHR2 17/45 Super-Reinforced - Ultra-light Hard anodized rear sprocket €219.54