Centric 121.34117 Disc Brake Rotor - Rear

Centric Rear Brake Rotor for BMW 550i GT and 750i

Centric C-TEK Standard Disc Brake Rotor 121.34117 is a rear vented rotor built for select BMW applications from 2009-2017. It combines smooth braking surface design with OE-style dimensions to support consistent brake feel on BMW 550i GT, 550i GT xDrive, 750i, 750i xDrive, 750Li, 750Li xDrive, and 760Li models.

Key Features

• Centric C-TEK Standard Disc Brake Rotors line for everyday service replacement
• Rear vented rotor with straight vane style for heat management
• Smooth surface type for even pad contact
• Outside diameter: 370.0 mm (14.567 in.)
• Nominal thickness: 23.8 mm (0.937 in.); discard thickness: 22.4 mm (0.882 in.)
• Center hole diameter: 75.0 mm (2.953 in.)
• 5-lug pattern with 120.0 mm bolt circle diameter
• ABS tone ring not included; bearings not included
• Disc mounting: floating / DIH

Product Details

The Centric C-TEK Standard Disc Brake Rotors line is positioned for service replacement where dependable braking performance, service life, and value matter. Part number 121.34117 is a rear disc brake rotor with a vented construction, straight vane design, and smooth friction surface to support stable pad engagement on larger BMW rear brake systems. This rotor cross-references Raybestos Brakes 980804R for the same application.

Compatible With BMW 550i GT, BMW 550i GT xDrive, BMW 750i, BMW 750i xDrive, BMW 750Li, BMW 750Li xDrive, and BMW 760Li rear brake applications. The 121.34117 rotor is sized for vehicles using a 370 mm rear rotor with a 5-lug, 120 mm bolt circle layout.

What This Rotor Helps Address

• Brake pulsation caused by worn or below-spec rear rotors
• Reduced braking consistency from uneven rotor surfaces
• Noise and vibration associated with rotor wear
• Loss of braking performance from heat-stressed rear brake components
• Service replacement needs on BMW rear brake systems

Installation Notes and Tips

Verify rotor diameter, thickness, center bore, and bolt pattern before installation. Inspect pads, calipers, and hub surfaces for wear or corrosion, and clean the hub face to help the rotor seat evenly. Because this rotor is vented and uses a smooth surface, proper bedding-in of new pads is important for consistent braking performance. Confirm rear-position fitment for your specific BMW model before ordering.

Quality Assurance

Centric designs the C-TEK Standard Disc Brake Rotors line for a balance of performance, service life, and value across a wide range of applications. Part number 121.34117 follows OE-style dimensional requirements for the listed BMW rear brake fitments.