AFAM 48010849 : AFAM Chain Kit 520XLR2 13/49 Standard - Ultra-Light Self-Cleaning Rear Sprocket €138.62
D.I.D : DID/JT Chain Kit 520ERT3 14/50 Super-Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €109.10
D.I.D : DID/JT Chain Kit 520ERT3 12/50 Super-Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €105.68