R1 Concepts 633-39008L RNC Drilled & Slotted Brake Rotor - Left

The R1 Concepts 633-39008L is a performance-grade drilled and slotted disc brake rotor from R1 Concepts' RNC series. Engineered to deliver enhanced stopping power over stock replacements, this left-side rotor is a direct OEM-fit upgrade requiring no modifications for installation.

Cross-Drilled Design: Precision-drilled holes are chamfered and countersunk to reduce heat stress and prevent cracking. The cross-drilled pattern dissipates heat rapidly, helping to lower rotor operating temperatures and reduce brake fade during demanding stops.

Diamond Slotted Pattern: R1 Concepts' exclusive diamond slot design removes brake dust and road debris from the rotor surface, preventing pad glazing and extending the service life of both the rotor and brake pads. The diamond-tipped slot ends also serve as a built-in wear indicator — when the tips disappear, it's time for replacement.

Key Features:

• Cross-drilled and diamond-slotted rotor surface for maximum heat dissipation and bite
• Countersunk drill holes to reduce the risk of cracking under thermal stress
• Zinc plating on hat and vane structure for corrosion resistance and longer service life
• Direct OEM-fit replacement — no cutting, drilling, or modification required
• Left-side fitment (driver side on most applications)
• Suitable for daily driving, street performance, light towing/hauling, and off-road use

R1 Concepts rotors arrive fully zinc-coated. During the initial bed-in process, the coating on the brake pad contact surface will wear away naturally, leaving the hub and inner vane structure protected. Always follow R1 Concepts' recommended break-in procedure and replace brake pads whenever installing new rotors.