Stoptech 128.34091R Disc Brake Rotor - Rear Right

Overview of StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotors (Part Number 128.34091R) are engineered for BMW models including the 130i, 325xi, 328i, 328i xDrive, 328xi, and X1. These rotors provide reliable braking performance with a vented design and cross-drilled surface to enhance heat dissipation and reduce brake fade.

• Cross-drilled surface for improved heat dissipation
• Vented rotor design to maintain optimal operating temperatures
• Coated hat finish for corrosion resistance
• Compatible with BMW 130i, 325xi, 328i, 328i xDrive, 328xi, and X1
• Part Number: 128.34091R
• Nominal thickness: 0.787 inches (20.000 mm)
• Discard thickness: 0.724 inches (18.400 mm)
• Outside diameter: 11.803 inches (299.800 mm)
• Overall height: 2.606 inches (66.200 mm)
• 5 lug holes with 0.571 inch (14.500 mm) diameter
• Floating/dih disc mounting with straight vane style

Product Line Details: StopTech Sport Cross-Drilled Disc Brake Rotors

The StopTech Sport Cross-Drilled Disc Brake Rotors line is designed to offer enhanced braking performance through advanced rotor surface technology. The cross-drilled pattern improves ventilation and helps dissipate heat more efficiently during aggressive driving or heavy braking. This product line focuses on maintaining consistent brake feel and reducing the risk of brake fade, making it suitable for both street and light track use. The vented rotor design further supports thermal management, while the coated hat finish protects against corrosion, extending rotor life.

Technical Specifications and Features

These rotors feature a nominal thickness of 0.787 inches (20.000 mm) and a discard thickness of 0.724 inches (18.400 mm), ensuring they meet OEM standards for durability and safety. The outside diameter measures 11.803 inches (299.800 mm), with an overall height of 2.606 inches (66.200 mm). The rotor includes a 5-lug hole pattern with a 4.724 inch (120.000 mm) bolt circle diameter and 0.571 inch (14.500 mm) lug hole diameter, compatible with specified BMW models. The floating/dih disc mounting and straight vane style design contribute to effective heat dissipation and rotor stability under load.

Common Applications and Problem Solving

• Replacement for worn or warped rotors on BMW 130i, 325xi, 328i, 328i xDrive, 328xi, and X1
• Improves brake cooling to reduce fade during spirited driving or towing
• Addresses rotor corrosion issues with coated hat finish
• Restores braking performance compromised by rotor surface damage
• Compatible upgrade for drivers seeking enhanced brake response and heat management

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (0.724 inches) before installation
• Clean mounting surfaces to prevent uneven rotor seating
• Torque lug nuts to manufacturer specifications for proper fitment
• Check compatibility with ABS sensors as this rotor does not include an ABS tone ring
• Inspect brake pads for wear and replace if necessary during rotor installation

Quality Assurance and Warranty

StopTech Sport Cross-Drilled Disc Brake Rotors are manufactured to meet or exceed OEM specifications for fit, form, and function. The coated hat finish provides corrosion resistance to extend rotor life. While specific warranty details are not provided, StopTech products typically come with a limited warranty against defects in materials and workmanship. It is recommended to verify warranty coverage with the product supplier or manufacturer.