D.I.D : DID/JT Chain Kit 520ERT3 13/50 Super-Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €105.92
JT DRIVE CHAIN 482447 : JT Chain Kit 520HDS 13/51 Super-Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €69.46
AFAM 48011937 : AFAM Chain Kit 520XSR 16/45 Super-Reinforced - Ultra-Light Hard Anodized Rear Sprocket €180.44