R1 Concepts 623-31004L RNC Drilled Brake Rotor Left

The R1 Concepts 623-31004L RNC Drilled Brake Rotor is a high-performance left-side disc brake rotor designed as a direct OE replacement with enhanced stopping power. The precision-drilled hole pattern improves heat dissipation, reduces brake fade, and helps expel gases and water from the rotor surface for consistent, reliable braking performance in both everyday driving and demanding conditions.

Key Features:

• Drilled Design: Cross-drilled holes promote rapid heat evacuation and reduce rotor weight for improved braking response
• Direct OE Fit: Engineered to match factory specifications for a straightforward bolt-on installation with no modifications required
• Left-Side Application: Specifically designed for the driver-side (left) wheel position — confirm fitment before ordering
• Corrosion-Resistant Finish: Protective coating on non-braking surfaces helps resist rust and corrosion for extended service life
• Balanced Performance: Precision-machined for minimal runout, ensuring smooth, vibration-free braking and reduced pedal pulsation
• Premium Grade Iron: Manufactured from high-quality grey cast iron for durability and optimal thermal capacity

The R1 Concepts RNC series brake rotor is an ideal upgrade for drivers seeking improved thermal performance over a standard OE rotor. Always replace rotors in axle pairs for balanced braking. Part number 623-31004L is the left-side rotor.