R1 Concepts 623-03031L RNC Drilled Disc Brake Rotor - Left

The R1 Concepts 623-03031L is a precision-drilled disc brake rotor from R1 Concepts' RNC (Rounded New-Cut) series. Designed as a direct-fit, driver-side (left) replacement rotor, it delivers enhanced stopping performance over standard blank rotors while maintaining OE-style fitment with no modifications required.

Key Features:

• Cross-Drilled Design: Precision-drilled holes are chamfered and countersunk to maximize heat dissipation, reduce brake fade, and prevent stress cracking under repeated braking cycles
• G3000 Grade Cast Iron Construction: Manufactured to OEM specifications using G3000 cast iron for consistent durability, stability, and reliable stopping power
• Zinc Plating: Full rotor zinc coating provides corrosion protection on the hub, vanes, and hat to extend service life and maintain appearance — the coating on the braking surface wears away naturally during break-in
• Direct-Fit Replacement: Engineered to OEM specifications for a straightforward installation with no drilling, cutting, or modification needed
• Left-Side Specific: This part number (623-03031L) is application-specific for the driver-side (left) position
• Vented Construction: Internal vane design promotes airflow through the rotor for improved thermal management during repeated stops

R1 Concepts recommends following a proper brake bed-in (break-in) procedure after installation to ensure optimal pad transfer and consistent braking performance. Always replace brake pads when installing new rotors for best results.