Vortex 525 Front Sprocket BMW S1000Rr / R / XR / M Features: Made of the high carbon steel for maximum strength. Induction hardened to reduce surface wear. Special Vortex nickel plating to resist corrosion. Precise tolerances to ensure concentricity. Drilled lightening holes reduce rotating mass on most applications. Note: Images are for reference only, actual sprocket may be different depending on make and model.