R1 Concepts 623-54122L RNC Series Drilled Brake Rotor - Left

The R1 Concepts 623-54122L RNC Series Drilled Brake Rotor is a direct-fit, performance-grade replacement brake rotor engineered to deliver confident stopping power and long-lasting durability. This is the left (driver) side rotor, designed to meet or exceed OEM specifications for a precise, no-modification installation.

Constructed from G3000 grade cast iron, this rotor provides excellent heat absorption and dissipation during repeated braking cycles. The cross-drilled hole pattern reduces rotor surface temperature by promoting airflow across the braking surface, helping to minimize brake fade under demanding driving conditions. Drilled holes are precision-chamfered and counter-sunk to maintain structural integrity and prevent cracking.

A protective zinc plating covers the non-braking surfaces of the rotor to guard against rust and corrosion, keeping the rotor looking clean and extending its service life. The braking surface features a double disc grind for a smooth, flat contact area that promotes faster, more even brake pad bed-in and quieter operation from the start.

Key Features:

• G3000 grade cast iron construction for strength and heat management
• Cross-drilled hole pattern for improved cooling and reduced brake fade
• Precision-chamfered and counter-sunk drill holes to prevent cracking
• Zinc-plated coating on non-braking surfaces for corrosion resistance
• Double disc ground braking surface for smooth, quiet pad contact
• Direct OEM replacement — no modifications required
• Left (driver) side fitment

The R1 Concepts RNC Series drilled brake rotor is an ideal upgrade or replacement for drivers seeking improved thermal performance and a clean appearance over a standard blank rotor, without sacrificing street reliability.