R1 Concepts 623-31111L RNC Series Drilled Disc Brake Rotor - Left

The R1 Concepts 623-31111L RNC Series Drilled Brake Rotor is a performance-grade, cross-drilled disc brake rotor engineered as a direct OEM replacement with enhanced stopping capability. Precision-manufactured to match factory specifications, this left-side rotor installs without modification for a straightforward upgrade from worn or stock rotors.

R1 Concepts rotors are cast from G3000-grade gray iron, delivering the consistent thermal stability and wear resistance demanded by both daily drivers and performance-oriented applications. The cross-drilled hole pattern improves heat dissipation, helps gas and debris evacuation from the rotor face, and contributes to reduced brake fade under repeated or hard braking.

Key Features:

• Cross-drilled design for improved cooling and reduced heat buildup
• G3000-grade cast iron construction for strength and longevity
• Silver zinc plating on non-braking surfaces protects against rust and corrosion
• Precision-machined to OEM dimensions — no modifications required for installation
• Left (driver) side fitment — sold as a single rotor
• Direct replacement for worn or damaged OE brake rotors

A proper break-in (bed-in) procedure is recommended after installation to ensure optimal pad transfer and even rotor wear. Compatible with a wide range of R1 Concepts brake pad compounds and most OEM-style pads.