JT SPROCKETS JTA210.52BLK : JT SPROCKETS Aluminium Ultra-Light Self-Cleaning Rear Sprocket 210 - 520 €34.06
RENTHAL 486855 : RENTHAL Chain Kit 520R3 13/48 Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €265.26
AFAM 48011572 : AFAM Chain Kit 520XLR2 13/51 Standard - Ultra-Light Hard Anodized Rear Sprocket €134.51
AFAM 3038554 : AFAM Chain Kit 520MX6 13/51 Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €141.67