R1 Concepts 623-54166L RNC Series Drilled Brake Rotor Left/Driver Side

The R1 Concepts 623-54166L RNC Series Drilled Brake Rotor is a precision-engineered replacement rotor designed to deliver confident stopping power and improved thermal performance over a standard OEM-style disc. This is the left/driver side rotor, identified by the "L" suffix in the part number.

R1 Concepts' RNC line features a drilled rotor design that promotes rapid heat dissipation and helps evacuate brake dust, gas, and water from the rotor surface during braking. The result is more consistent brake pad contact, reduced brake fade under demanding conditions, and enhanced wet-weather performance.

Key Features:

• Drilled rotor design for improved heat dissipation and gas venting
• Left/driver side fitment (sold individually)
• Manufactured to OEM-equivalent dimensions for direct bolt-on installation
• Premium G3000 grade cast iron construction for durability and long service life
• Zinc dichromate or e-coating finish on non-swept surfaces to resist corrosion during storage and break-in
• Precision-balanced to minimize vibration and brake pedal pulsation
• Meets or exceeds OEM specifications

The R1 Concepts 623-54166L is sold as a single rotor and is intended as a direct replacement for vehicles requiring a drilled front or rear disc brake rotor on the driver side. Always replace brake rotors in axle pairs for balanced braking performance.