JT DRIVE CHAIN 483415 : JT Chain Kit 520HDS 12/48 Super-Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €71.94
RENTHAL 123U-520-51GPHA : RENTHAL Aluminium Ultra-Light Self-Cleaning Hard Anodized Rear Sprocket 123U - 520 €76.28
RENTHAL 487521 : RENTHAL Chain Kit 520R1 13/49 Standard - Ultra-Light Self-Cleaning Rear Sprocket €235.42