R1 Concepts 631-92017L RNC Series Drilled & Slotted Brake Rotor

The R1 Concepts 631-92017L is an RNC Series cross-drilled and slotted brake rotor engineered to deliver enhanced stopping performance over standard OEM replacement rotors. Featuring precision machining to OEM specifications, this rotor installs directly without modification and is designed for reliable, consistent braking across a wide range of driving conditions.

Key Features:

• Cross-Drilled Holes: Countersunk and chamfered drill pattern reduces heat buildup on the rotor surface by venting gases and heat, while the chamfered edges help prevent stress cracking
• Diamond Slot Technology: Exclusive slotted pattern sweeps away brake dust, debris, and gases from the pad surface, preventing pad glazing and extending the life of both the pad and rotor. Diamond-tipped slot ends also serve as a visual wear indicator — when the tips are gone, rotor replacement is recommended
• Silver Zinc Plating: Full rotor zinc coating protects non-braking surfaces from corrosion, preserving the hub, vanes, and hat for a cleaner appearance and longer service life
• OEM-Matched Specifications: Engineered to factory dimensions for a direct-fit, no-modification installation
• Left-Side Fitment: This part number (631-92017L) is specifically the left/driver-side rotor

R1 Concepts RNC Series rotors are well-suited for daily driving, street performance, light towing, and hauling applications. A proper bed-in procedure is recommended after installation to ensure optimal braking performance and even pad transfer.