Vortex 520 F5 Aluminum Rear Sprocket BMW S1000Rr / S1000R / S1000Xr Features: Ptfe black hardcoat Lightweight 7075 T6 aluminum construction 100 CNC-machined to high tolerances Weight-saving cutouts Unique tooth design Offers improved concentricity which provides a stronger, quieter and longer-lasting sprocket Note: Sprocket shape and size will vary depending on model, picture is for reference only