Centric 121.66050 Disc Brake Rotor - Rear

Reliable Disc Brake Rotor for Chevrolet and GMC 3500 Series

The Centric C-TEK Standard Disc Brake Rotor 121.66050 is engineered for dependable braking performance on heavy-duty Chevrolet and GMC trucks. Designed specifically for models like the Silverado 3500 HD and Sierra 3500 Classic, this vented rotor ensures consistent heat dissipation and durability under demanding conditions.

• Vented disc brake rotor with straight vane design for effective cooling
• Nominal thickness of 1.181 inches (30.000 mm) with discard thickness at 1.122 inches (28.500 mm)
• Overall height of 5.177 inches (131.500 mm) and outside diameter of 12.795 inches (325.000 mm)
• Eight stud/lug holes with a 6.500 inch (165.100 mm) bolt circle diameter
• Center hole diameter of 4.835 inches (122.800 mm) for precise fitment
• Solid smooth surface type without ABS tone ring included
• Weight approximately 29 lbs (13.18 kgs) for balanced performance

About the C-TEK Standard Disc Brake Rotors Line

The C-TEK Standard Disc Brake Rotors line by Centric offers a balance of quality and value for professional and commercial vehicle applications. This product line focuses on providing rotors that meet or exceed OEM specifications, featuring vented designs to improve heat dissipation and reduce brake fade. The 121.66050 rotor is part of this line, delivering consistent braking performance for Chevrolet Express 3500 and GMC Savana 3500 vans, as well as heavy-duty Silverado and Sierra 3500 trucks.

Technical Details and Specifications

This disc brake rotor features a vented design with straight vanes to optimize airflow and cooling during braking. The nominal thickness is 1.181 inches (30.000 mm), with a discard thickness of 1.122 inches (28.500 mm), ensuring safe replacement intervals. The rotor’s outside diameter measures 12.795 inches (325.000 mm), and it has an overall height of 5.177 inches (131.500 mm). It mounts using eight lug holes with a 6.500 inch (165.100 mm) bolt circle diameter and a center hole diameter of 4.835 inches (122.800 mm). The smooth surface type is designed for consistent pad contact without ABS tone ring integration.

Common Applications and Problem Solving

• Replacement for worn or warped rotors on Chevrolet Silverado 3500 HD and GMC Sierra 3500 Classic
• Addresses brake pulsation and vibration issues caused by rotor surface irregularities
• Improves heat dissipation to reduce brake fade during heavy towing or hauling
• Restores proper rotor thickness to maintain braking efficiency and safety
• Compatible with Chevrolet Express 3500 and GMC Savana 3500 for reliable stopping power

Installation Notes and Tips

Ensure the rotor surface is clean and free of rust or debris before installation. Verify the rotor thickness is above the discard limit of 1.122 inches (28.500 mm) to maintain safety standards. Use proper torque specifications for the eight lug nuts on the 6.500 inch (165.100 mm) bolt circle. This rotor does not include bearings or an ABS tone ring, so confirm compatibility with your vehicle’s braking system. It is recommended to replace brake pads simultaneously to ensure even wear and optimal braking performance.

Quality Assurance and Warranty

Centric’s C-TEK Standard Disc Brake Rotors are manufactured to meet or exceed OEM standards for fit, form, and function. Each rotor undergoes rigorous quality control to ensure durability and consistent performance. While specific warranty details for part number 121.66050 are not provided here, Centric typically offers limited warranties covering defects in materials and workmanship. Consult product documentation or Centric directly for warranty terms applicable to this rotor.