AFAM : AFAM Chain Kit 520XHR2 15/41 Super-Reinforced - Ultra-light Hard Anodized Rear Sprocket Without Ducati Rear Sprocket Car €199.64
AFAM 48010379 : AFAM Chain Kit 520XRR3 13/49 Reinforced - Ultra-Light Self-Cleaning Rear Sprocket €153.02
RENTHAL 1500-520-49GPBU : RENTHAL Twinring Aluminium Ultra-Light Self-Cleaning Hard Anodized Rear Sprocket 1500 - 520 €157.78