R1 Concepts 623-31097L RNC Series Drilled Brake Rotor - Left

The R1 Concepts 623-31097L is a left-side RNC Series cross-drilled brake rotor engineered as a direct-fit replacement for improved stopping performance. Built to original equipment specifications, this rotor installs without modification and delivers confident, consistent braking for daily driving and light performance use.

Constructed from G3000 grade cast iron, this rotor meets or exceeds OEM dimensional standards for a precise, rattle-free fit. The cross-drilled hole pattern reduces heat buildup on the rotor face, improving fade resistance and helping maintain consistent pedal feel under repeated stops. Countersunk drilling helps prevent stress cracking common in lesser drilled rotors.

A zinc plating finish is applied to the hat, hub, and vane areas to resist corrosion and maintain a clean appearance over time. During break-in, the coating on the braking surface wears away naturally, leaving the non-contact surfaces protected.

Key Features:

• G3000 grade cast iron construction for durability and thermal stability
• Cross-drilled holes reduce rotor temperature and brake fade
• Countersunk drilled holes help prevent cracking under stress
• Zinc plated finish on hub and vanes for corrosion resistance
• Double disc ground surface promotes even, fast brake pad bed-in
• OEM-spec dimensions — no modifications required for installation
• Left-side application (driver side)

For best results, replace brake pads at the same time as rotors and follow R1 Concepts' recommended break-in procedure after installation.