D.I.D : DID/JT Chain Kit 520ERT3 13/47 Super-Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €103.17
RENTHAL 2240-520-50GPOR : RENTHAL Twinring Aluminium Ultra-Light Self-Cleaning Hard Anodized Rear Sprocket HA - 520 €157.78
AFAM 3039122 : AFAM Chain Kit 520MX6 14/50 Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €144.54
AFAM 48010051 : AFAM Chain kit 520XSR 16/46 Super-Reinforced - Ultra-light Hard anodized rear sprocket €185.24