R1 Concepts 623-26003L RNC Series Drilled Brake Rotor - Left

The R1 Concepts 623-26003L is a RNC Series drilled brake rotor designed as a direct OE replacement with enhanced performance characteristics. R1 Concepts engineers their RNC rotors using premium G3000 grade cast iron — the same grade specified by most original equipment manufacturers — ensuring consistent thermal stability, smooth surface contact, and long service life.

The precision-drilled hole pattern serves a dual purpose: it reduces overall rotor weight for improved unsprung mass dynamics, and it promotes rapid heat dissipation and gas venting under aggressive braking conditions. Each rotor is precision machined to strict OE dimensional tolerances and features a non-directional finish on the braking surface for immediate, bedding-free performance right out of the box.

Key Features:

• G3000 Grade Cast Iron — OEM-specified alloy for superior strength and heat resistance
• Drilled Hole Pattern — Promotes cooling, gas venting, and weight reduction
• OE Dimensional Tolerances — Direct bolt-on fitment, no modifications required
• Electrophoretic (E-Coat) or Zinc Dichromate Finish — Corrosion-resistant coating on non-braking surfaces
• Non-Directional Braking Surface — Ready to install without extended bed-in procedures
• Left Side Fitment — Designated driver-side application

R1 Concepts brake rotors are manufactured to meet or exceed FMSI (Friction Materials Standards Institute) standards and are tested for proper balance and runout before leaving the factory. This rotor is the ideal upgrade or replacement for drivers seeking improved braking feel and durability over standard OE components.