Centric 121.99013 Disc Brake Rotor - Rear

Overview of Centric C-TEK Standard Disc Brake Rotor 121.99013

The Centric C-TEK Standard Disc Brake Rotor 121.99013 is engineered for reliable braking performance on BMW 120i models. Designed as a solid rotor with a smooth surface, it offers consistent stopping power and durability for everyday driving conditions.

• Compatible with BMW 120i vehicles
• Part number 121.99013 for precise identification
• Solid disc brake rotor with smooth surface finish
• Overall diameter of 11.642 inches (295.7 mm)
• Nominal thickness of 0.413 inches (10.5 mm) and discard thickness of 0.350 inches (8.9 mm)
• Floating disc mounting design
• Five lug holes with 0.575 inch (14.6 mm) diameter
• Center hole diameter of 2.953 inches (75 mm)
• Weight approximately 11 lbs (5 kg)

About the C-TEK Standard Disc Brake Rotors Line

The C-TEK Standard Disc Brake Rotors line by Centric focuses on delivering dependable, OE-quality replacement rotors. This product line emphasizes precise fitment and consistent braking performance, making it suitable for drivers seeking a direct replacement rotor without additional features like venting or ABS tone rings. The 121.99013 rotor exemplifies this approach with its solid construction and smooth surface, designed to meet the specifications required by BMW 120i models.

Technical Specifications and Features

This Centric rotor features a solid design with a smooth surface type, which helps provide stable braking under normal driving conditions. The rotor measures 11.642 inches in outside diameter and has a nominal thickness of 0.413 inches, with a discard thickness of 0.350 inches, indicating when replacement is necessary. The overall height is 2.563 inches, and it includes a floating disc mounting system to accommodate slight movement and reduce stress on the braking components. The rotor has five lug holes with a diameter of 0.575 inches and a mounting bolt hole circle diameter of 4.724 inches, ensuring proper fitment on the BMW 120i hub assembly. This rotor does not include an ABS tone ring or bearings.

Common Applications and Problem Solving

• Replacement for worn or warped rotors on BMW 120i
• Restores smooth braking performance and pedal feel
• Addresses rotor thickness below discard limits causing brake fade
• Eliminates vibrations or pulsations during braking
• Suitable for routine maintenance and brake system overhauls

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 thickness of 0.350 inches to maintain safety standards. Use proper torque specifications for lug nuts and mounting bolts to avoid rotor warping. Since this rotor does not include bearings or ABS tone rings, reuse existing components or replace separately as needed. It is recommended to inspect brake pads and other hardware during rotor replacement for optimal braking system performance.

Quality Assurance and Warranty

Centric manufactures the C-TEK Standard Disc Brake Rotors to meet or exceed OEM specifications for fit, form, and function. While specific warranty details are not provided here, Centric products typically come with a limited warranty against defects in materials and workmanship. Refer to Centric’s official documentation for complete warranty information.