The RDA Front Brake Disc Rotor is a direct-fit replacement for BMW X3 AWD models built from 2017 to 2019. Vane geometry is matched to the original design so cooling airflow and thermal expansion behave as the factory intended. Supplied with a light protective oil film; clean with brake cleaner before fitting. Runout is held under 0.05mm at the mounting face, which prevents the pedal pulsation that follows a poorly machined rotor. The casting is fully machined, dynamically balanced and given a protective coating on the hat and edges to slow surface rust. Outside diameter is 293mm with a new thickness of 30mm and a minimum machining thickness of 24mm. The Steel casting is high-carbon enriched for better damping and quieter braking. Supplied new and backed by a 12 Months warranty.