R1 Concepts 623-54170L RNC Series Drilled Disc Brake Rotor - Left

The R1 Concepts 623-54170L RNC Series Drilled Brake Rotor is a precision-engineered performance replacement rotor designed for drivers who demand improved braking response and thermal management over a standard OE rotor. This is the left (driver) side rotor, sold individually.

The RNC (Race N Cruise) Series features a drilled pattern across the rotor face, which promotes rapid heat dissipation, reduces brake fade under demanding conditions, and helps expel gas and debris from the rotor-pad interface. The result is more consistent, confident stopping power whether you're commuting daily or pushing hard on a mountain road.

Key Features:

• Drilled rotor design for superior heat dissipation and reduced brake fade
• Manufactured from G3000 grade cast iron for strength, durability, and long service life
• Zinc dichromate finish provides corrosion resistance and a clean, show-quality appearance
• Precision-balanced and OEM-spec dimensions ensure direct fit with no modifications required
• Drilled holes feature countersunk edges to reduce stress cracking
• Left (driver) side fitment — sold as a single rotor
• Designed for street performance, light towing, and spirited driving applications

R1 Concepts rotors are computer-balanced and tested to meet or exceed OEM specifications, delivering a quiet, vibration-free braking experience. The 623-54170L is a direct bolt-on replacement that pairs seamlessly with R1 Concepts ceramic or carbon-fiber brake pads for a complete brake system upgrade.