Centric 121.34077 Disc Brake Rotor - Front

Overview of Centric C-TEK Standard Disc Brake Rotor 121.34077

The Centric C-TEK Standard Disc Brake Rotor 121.34077 is engineered for reliable braking performance on select BMW models. Designed as a vented rotor with a smooth surface, it provides consistent stopping power and heat dissipation for vehicles like the BMW 320i and 328xi.

• Compatible with BMW 120i, 125i, 128i, 320i, 325i, 325xi, 328i, and 328xi models
• Part number 121.34077 ensures precise fitment
• Vented rotor design for improved heat management
• Nominal thickness of 0.945 inches (24.000 mm) with discard thickness at 0.882 inches (22.400 mm)
• Overall height of 2.906 inches (73.800 mm) and outside diameter of 11.803 inches (299.800 mm)
• Floating disc mounting with straight vane style for efficient airflow
• Five lug holes with a 4.724 inch (120.000 mm) bolt circle diameter

Product Line Details: C-TEK Standard Disc Brake Rotors

The C-TEK Standard Disc Brake Rotors line by Centric offers rotors designed to meet or exceed OEM specifications for fit, form, and function. This product line focuses on providing solid and vented rotors with smooth surfaces to ensure consistent braking performance and durability. The 121.34077 rotor is a vented type, which helps maintain optimal operating temperatures during braking, making it suitable for daily driving conditions on compatible BMW vehicles.

Technical Specifications and Features

This disc brake rotor features a nominal thickness of 0.945 inches (24.000 mm) and a discard thickness of 0.882 inches (22.400 mm), indicating the minimum thickness before replacement is necessary. The rotor’s overall height measures 2.906 inches (73.800 mm), and it has an outside diameter of 11.803 inches (299.800 mm). It includes a center hole diameter of 3.110 inches (79.000 mm) and five stud/lug holes each measuring 0.579 inches (14.700 mm) in diameter, arranged on a 4.724 inch (120.000 mm) bolt circle diameter. The rotor is vented with straight vanes to promote effective heat dissipation and prevent brake fade. It does not include an ABS tone ring or bearings.

Applications and Problem Solving

• Replacement for worn or warped rotors on BMW 120i, 125i, 128i, 320i, 325i, 325xi, 328i, and 328xi models
• Addresses brake pulsation caused by uneven rotor surfaces
• Improves braking consistency by restoring proper rotor thickness
• Helps reduce overheating and brake fade during regular driving
• Suitable for vehicles requiring vented rotors with floating disc mounting

Installation Notes and Tips

Ensure the rotor thickness is measured before installation to confirm it meets or exceeds the nominal thickness of 0.945 inches (24.000 mm). Clean the rotor surface to remove any protective coatings or contaminants prior to mounting. Verify the bolt hole pattern and center hole diameter match the vehicle specifications. Since this rotor does not include bearings or an ABS tone ring, reuse existing components if applicable. Proper torque specifications should be followed when securing the rotor to the hub.

Quality Assurance and Warranty

Centric’s C-TEK Standard Disc Brake Rotors are manufactured to meet OEM standards for quality and durability. The 121.34077 rotor undergoes rigorous testing to ensure consistent performance and fitment on compatible BMW models. Warranty coverage details should be confirmed with the product documentation or manufacturer.