D.I.D : DID/JT Chain Kit 520ERT3 13/51 Super-Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €104.99
AFAM 3039860 : AFAM Chain Kit 520MX6 13/50 Reinforced - Ultra-Light Hard Anodized Rear Sprocket €133.91
PBR 270 51 TC4 : PBR Twin Color Aluminium Ultra-Light Self-Cleaning Hard Anodized Rear Sprocket 270 - 520 €52.30
D.I.D : DID/PBR Chain Kit 520ERT3 14/52 Super-Reinforced - Ultra-Light Self-Cleaning Hard Anodized Rear Sprocket €122.39