D.I.D : DID/JT Chain Kit 520ERT3 14/52 Super-Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €115.74
D.I.D 485744 : DID/PBR Chain Kit 520ERV7 17/46 Racing - Ultra-Light Hard Anodized Rear Sprocket €241.01
RENTHAL 483598 : RENTHAL Chain Kit 520R1 13/49 Standard - Ultra-Light Self-Cleaning Rear Sprocket €221.48