AFAM 48011407 : AFAM Chain kit 520XRR3 13/48 Reinforced - Ultra-light Self-cleaning rear sprocket €159.89
AFAM 48010737 : AFAM Chain kit 520MR2 09/42 Standard - Ultra-light Hard anodized rear sprocket €98.16
D.I.D : DID/JT Chain Kit 520ERT3 15/45 Super-Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €101.46