JT SPROCKETS JTA210.50BLK : JT SPROCKETS Aluminium Ultra-Light Self-Cleaning Rear Sprocket 210 - 520 €32.70
RENTHAL 224U-520-42GPOR : RENTHAL Aluminium Ultra-Light Self-Cleaning Rear Sprocket 224U - 520 €80.25
D.I.D 3028036 : DID/JT Chain kit 525ZVM-X2 15/42 Super-Reinforced - Ultra-light rear sprocket €162.82
AFAM 48011402 : AFAM Chain kit 520MR2 10/38 Standard - Ultra-light Hard anodized rear sprocket €89.26
AFAM 48011900 : AFAM Chain Kit 520XSR 15/42 Super-Reinforced - Ultra-Light Hard Anodized Rear Sprocket €178.75