Centric 320.34107H Disc Brake Rotor - Rear

Centric GCX Rear Brake Rotor Overview

The Centric GCX Elemental Protection Disc Brake Rotor, part number 320.34107H, is a rear vented rotor built for OE-style braking performance and corrosion resistance. It is a fitment-based replacement for select BMW 125i, 128i, and 120i models and uses a fully coated finish for added protection on non-mating surfaces.

For drivers searching for a rear brake rotor for BMW 128i or BMW 125i applications, this Centric GCX rotor combines application-specific metallurgy with a smooth surface and coated hat finish. The result is a direct-fit disc brake rotor engineered around the vehicle’s OEM profile.

Key Features

• Part number 320.34107H
• Rear disc brake rotor for select BMW applications
• Fully coated disc finish with coated hat finish
• Vented rotor design with straight vane style
• Smooth surface type for consistent pad contact
• High carbon content metallurgy matched to OEM-style requirements
• Outside diameter: 300.000 mm (11.811 in.)
• Nominal thickness: 19.800 mm (0.780 in.)
• Discard thickness: 18.400 mm (0.724 in.)
• 5-lug pattern with 120.000 mm bolt circle diameter

Product Line Details

Centric’s GCX Elemental Protection rotor line is built around application-specific coating patterns and metallurgy. The RS200-style coating is applied to non-mating surfaces to help resist rust and corrosion, while the rotor alloy is selected to align with the OEM metallurgical profile for the vehicle. This approach supports consistent braking feel and long-term appearance on daily-driven BMW rear brake applications.

Vehicle Fitment

• Fits 2009-2013 BMW 125i, rear.
• Fits 2008-2013 BMW 128i, rear.
• Fits 2011 BMW 120i, rear.

Common Replacement Reasons

• Rear brake rotor wear below service thickness
• Brake pulsation from rotor surface variation
• Rust and corrosion on exposed rotor surfaces
• Noise or uneven pad contact from worn rotors
• Need for an OE-style rear rotor for BMW 125i, BMW 128i, or BMW 120i models

Installation Notes and Tips

Verify rotor diameter, center hole diameter, bolt circle, and thickness before installation. This rear rotor uses a 5-lug, 120 mm bolt pattern and a 75 mm center hole diameter. Inspect pads, calipers, and hub surfaces during service so the new rotor seats correctly and maintains smooth braking performance. This part number 320.34107H is intended for rear axle applications only on the listed BMW models.

Quality Assurance

Centric manufactures GCX rotors with application-specific coating patterns and high-carbon metallurgy to match OE-style requirements. The fully coated design and corrosion-resistant finish are intended to support durable service life and consistent appearance on the vehicle.