AFAM 48012244 : AFAM Chain Kit 525XHR3 17/38 Super-Reinforced - Ultra-Light Hard Anodized Rear Sprocket €206.51
D.I.D 3041182 : DID/PBR Chain Kit 525ZVM-X2 16/41 Super-Reinforced - Ultra-Light Hard Anodized Rear Sprocket €203.27
D.I.D : DID/PBR Chain Kit 420D 12/51 (No OEM Ratio) Standard - Aluminium Ultra-Light Rear Sprocket €55.39