Centric 121.66005 Disc Brake Rotor - Front

Overview of Centric C-TEK Standard Disc Brake Rotor 121.66005

The Centric C-TEK Standard Disc Brake Rotor 121.66005 is engineered for reliable braking performance on Chevrolet and GMC heavy-duty trucks and vans. Designed to meet OEM specifications, this vented rotor ensures consistent heat dissipation and durability for vehicles such as the Chevrolet C20 and GMC R2500 Suburban.

• Vented disc brake rotor with smooth surface finish
• Outside diameter: 12.5 inches (317.5 mm)
• Nominal thickness: 1.291 inches (32.8 mm)
• Discard thickness: 1.215 inches (30.86 mm)
• Eight stud/lug holes with 0.563 inch stud thread diameter
• Center hole diameter: 4.591 inches (116.6 mm)
• Mounting bolt hole circle diameter: 6.5 inches (165.1 mm)
• Weight: approximately 38.6 lbs (17.55 kgs)
• Compatible with Chevrolet and GMC models including C20, C2500, C3500, G30, P20, P30, R20, and R2500 Suburban

Product Line Details: C-TEK Standard Disc Brake Rotors

The C-TEK Standard Disc Brake Rotors line by Centric offers rotors manufactured to meet or exceed OEM standards for fit, form, and function. This product line focuses on providing reliable, vented rotors with smooth surfaces designed for consistent braking performance and heat management. The 121.66005 rotor is part of this line, ensuring compatibility and durability for heavy-duty Chevrolet and GMC trucks and vans.

Technical Specifications and Features

This vented disc brake rotor features a nominal thickness of 1.291 inches (32.8 mm) and a discard thickness of 1.215 inches (30.86 mm), providing a clear service life indicator. The rotor’s outside diameter measures 12.5 inches (317.5 mm), suitable for heavy-duty braking applications. It includes eight stud holes with a 0.563 inch thread diameter and a mounting bolt hole circle diameter of 6.5 inches (165.1 mm), ensuring precise fitment on compatible Chevrolet and GMC models. The rotor’s smooth surface type supports consistent pad contact and braking efficiency.

Compatible Vehicles and Applications

• Chevrolet C20 and C20 Suburban
• Chevrolet C30, C2500, and C2500 Suburban
• Chevrolet C3500
• GMC G30, P20, P30, P2500, and P3500
• GMC R20, R20 Suburban, R2500, and R2500 Suburban

Common Issues Addressed by This Rotor

• Brake rotor warping and vibration under heavy load
• Reduced braking efficiency due to worn or thin rotors
• Overheating caused by insufficient heat dissipation
• Uneven brake pad wear from damaged rotor surfaces
• Noise and pulsation during braking

Installation Notes and Tips

Ensure the rotor mounting surface and hub are clean and free of rust or debris before installation. Verify the rotor thickness is above the discard thickness of 1.215 inches (30.86 mm) to maintain safe braking performance. Use proper torque specifications for the eight lug nuts with 0.563 inch stud thread diameter. This rotor does not include bearings or ABS tone rings, so verify compatibility with your vehicle’s existing components. Proper bedding of brake pads after installation is recommended to optimize rotor and pad performance.

Quality Assurance and Warranty

Centric’s C-TEK Standard Disc Brake Rotors are manufactured to meet OEM quality standards, ensuring reliable performance and fitment. While specific warranty details for part number 121.66005 are not provided here, Centric typically offers limited warranties covering defects in materials and workmanship. Refer to Centric’s official documentation for complete warranty information.