R1 Concepts 623-46035L RNC Series Drilled Brake Rotor - Left

The R1 Concepts 623-46035L RNC Series Drilled Brake Rotor is a precision-engineered replacement brake rotor designed to deliver reliable stopping power and long-lasting performance. This is the left (driver) side rotor, engineered to direct OEM-spec fitment with upgraded drilled rotor technology.

R1 Concepts' RNC Series rotors are manufactured from high-quality G3000 gray cast iron, the same material specification used in OEM brake rotors, ensuring consistent thermal stability and fade resistance under repeated braking. The cross-drilled holes improve heat dissipation, help evacuate gas and debris from the braking surface, and reduce overall rotor weight for improved unsprung mass performance.

Key Features:

• Drilled rotor design for improved heat dissipation and brake bite
• Manufactured from G3000 grade cast iron for OEM-equivalent durability
• Silver zinc dichromate coating on non-braking surfaces to resist corrosion and rust
• Precision-balanced and computer-optimized for minimal runout and vibration
• Left (driver) side application — sold individually
• Direct OEM replacement — no modifications required for installation

The R1 Concepts RNC Series is an ideal upgrade for drivers seeking improved braking aesthetics and thermal performance over a standard smooth rotor, without sacrificing street-friendly daily drivability. Each rotor is individually inspected to tight tolerances for consistent, quiet braking performance.