The DFC Geomet-coated left front drilled rotor for 2021–2025 BMW M4 is a hi-carbon alloy direct-fit replacement intended to restore precise front braking with drilled rotor ventilation. Made with G3000/G11H18 iron castings and OE vane configuration for heat dissipation, the rotor is precision mill-balanced, fine-turned to a 16 RMS finish to aid pad break-in, and Geomet-coated to resist corrosion. DTV ≤0.10 mm; lateral runout ≤0.50 mm.

DFC 21-25 BMW M4 Left Front Drilled Hi-Carbon Alloy GEOMET Coated Rotor