R1 Rear Left Black Drilled Brake Rotor 2012-2020 BMW 328I/440I Convertible & More - 623-31109L

R1 Rear Left Black Drilled Brake Rotor 623-31109L is engineered for select 2012-2020 BMW 328I, 440I Convertible and additional listed models applications. This eLINE Black Series rotor combines a performance-focused cross-drilled braking surface with a black zinc finish designed to help protect exposed non-friction areas from corrosion while delivering a clean, aggressive appearance. Precision-drilled and countersunk openings are designed to promote heat dissipation during repeated braking, making this rotor a strong street-performance replacement for drivers who want both function and style. This is a side-specific Rear Left rotor; verify the axle and side before ordering.

Key Features & Specs:

• Brand: R1 Concepts
• Series: eLINE Black Drilled
• SKU: rnc623-31109L
• Part Number: 623-31109L
• UPC: 198502684849
• Rotor Position: Rear Left
• Rotor Type: Cross-drilled brake rotor
• Finish: Black zinc
• Corrosion Protection: Rust-resistant coating on protected non-friction surfaces
• Sold As: Individual rotor
• Weight: 18.2 lb
• Fitment Orientation: Rear Left — side-specific; manufacturer part-number orientation must be matched correctly
• Performance Focus: Street-performance heat management and corrosion-resistant appearance
• Bedding Note: Black zinc wears from the pad-contact surface during normal bedding while remaining on non-friction areas

Fitment:

• 2012-2020 BMW 328I, 440I Convertible, 430I Xdrive Gran Coupe, 428I Xdrive Gran Coupe, 428I Gran Coupe, 335I, 335I GT Xdrive, 330I, 328I Xdrive, 328XI, 428I Xdrive Coupe & Convertible, Activehybrid 3, 430I Gran Coupe, 440I Gran Coupe, 335I Xdrive, 340I Xdrive, 435I Xdrive, 340I GT Xdrive, 435I, 430I Xdrive, 440I Xdrive Coupe, 435I Gran Coupe, 435I Xdrive Gran Coupe, 330I Xdrive Sedan, 440I Xdrive Convertible, 430I, 440I Coupe, 340I, 440I Xdrive Gran Coupe
• Rotor Location: Rear Left

R1 eLINE Black Drilled Brake Rotor Series:

R1 eLINE Black Series Drilled Brake Rotors combine performance-oriented cross-drilled construction with a protective black zinc finish for drivers looking to upgrade braking appearance, heat management and corrosion resistance. Precision-drilled openings help promote heat dissipation during repeated braking, while countersunk hole edges are engineered to reduce stress concentration around the drilled surfaces. Built around application-specific replacement dimensions, the eLINE Black Drilled series offers a performance-focused rotor option for street-driven cars, trucks and SUVs.

The rotor arrives with a full black zinc finish. During proper bedding, the coating on the brake-pad contact surface naturally wears away to expose the metallic friction surface while the black finish remains on protected non-contact areas such as the rotor hat. Rotor construction, dimensions and fitment vary by application, so axle position and left/right orientation should always be matched to the individual manufacturer part number.