R1 Concepts 633-39005L RNC Drilled & Slotted Brake Rotor - Left

The R1 Concepts 633-39005L RNC Series Drilled and Slotted Brake Rotor is a high-performance disc brake rotor engineered for drivers who demand superior stopping power and long-term durability. This is a single left-side (driver side) replacement rotor built to OEM fitment specifications with no modifications required.

Key Features:

• Cross-Drilled Holes: Precision-drilled and countersunk holes reduce heat buildup, enhance rotor ventilation, and minimize the risk of cracking under heavy braking loads
• Diamond Slot Technology: Directional slots evacuate brake dust, gas, and debris from the pad surface, prevent pad glazing, and extend the service life of both the rotor and brake pads — the slot endpoints also serve as a built-in rotor wear indicator
• G3000 Grade Cast Iron Construction: Manufactured from premium G3000 cast iron for consistent thermal performance, fade resistance, and long wear life
• Zinc Plated Corrosion Protection: Factory-applied zinc coating protects non-braking surfaces (hub, hat, and vane structure) from rust and corrosion for improved appearance and longevity
• Double Disc Ground Braking Surface: Provides a precision-flat pad contact surface that promotes faster, more even brake pad bed-in and delivers quieter, smoother stops
• Direct OEM Replacement: Engineered to OEM dimensional specifications for a direct bolt-on fit with no cutting, drilling, or modifications needed

Break-In Note: When first received, the rotor will be fully coated in zinc. During the initial bed-in process, the zinc coating will naturally wear away from the braking surface where pads contact the rotor — this is normal and expected. The hub, hat, and inner vane structure will retain their protective coating.

The R1 Concepts RNC Series rotor is well-suited for daily driving, street performance, light towing, and spirited driving applications where enhanced heat dissipation and consistent brake feel are a priority.