R1 Concepts 623-03040L RNC Series Drilled Brake Rotor Left

The R1 Concepts 623-03040L is an RNC Series drilled brake rotor designed as a direct OE-style replacement with enhanced performance characteristics. Engineered for the driver-side (left) position, this rotor features precision-drilled holes across the friction surface to improve heat dissipation, reduce brake fade, and evacuate gas and debris during hard braking.

R1 Concepts rotors are manufactured using high-quality G3000 grey iron casting, meeting or exceeding OEM specifications for a precise, no-modification fit. Each rotor undergoes strict quality control to ensure consistent thickness variation, lateral runout, and surface finish right out of the box.

Key Features:

• Precision cross-drilled holes for superior heat dissipation and fade resistance
• G3000 grey iron construction for durability and long service life
• Direct OEM replacement — no drilling, cutting, or modification required
• Driver-side (left) specific fitment
• Corrosion-resistant coating on non-friction surfaces to resist rust and extend rotor life
• Balanced and precision-machined for smooth, vibration-free braking performance
• Meets or exceeds FMSI/SAE standards

The R1 Concepts 623-03040L is an excellent upgrade from plain OEM rotors, delivering improved stopping power and thermal management for daily driving and spirited performance use alike.