Stoptech 127.34109R Disc Brake Rotor - Rear Right

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors Overview

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors (Part Number 127.34109R) are engineered for BMW 135i and 135is models. These rotors provide enhanced braking performance through a vented design combined with cross-drilled and slotted surfaces to improve heat dissipation and pad bite.

• Compatible with BMW 135i and 135is models
• Vented disc brake rotor design for improved cooling
• Cross-drilled and slotted surface for better brake pad contact and debris removal
• Coated hat finish to resist corrosion
• Overall diameter of 324 mm (12.756 inches) and height of 77.1 mm (3.035 inches)
• Nominal thickness of 21.8 mm (0.858 inches) with discard thickness at 20.4 mm (0.803 inches)
• Five lug holes with a 120 mm (4.724 inches) bolt circle diameter
• Floating/dih disc mounting with straight vane style for consistent airflow
• Weight approximately 8.05 kg (17.7 lbs)

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

The StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors line is designed to enhance braking efficiency and durability for performance-oriented vehicles. This product line features rotors with vented construction and a combination of cross-drilled holes and slots to optimize heat dissipation and maintain consistent braking under demanding conditions. The coated hat finish helps protect against corrosion, extending rotor life. This rotor, part number 127.34109R, fits BMW 135i and 135is models, providing a balance of performance and reliability.

Technical Specifications and Features

These rotors feature a vented design with straight vanes to promote airflow and reduce heat buildup during braking. The cross-drilled and slotted surface improves pad bite and helps evacuate gases, dust, and water from the rotor surface. The coated hat finish offers corrosion resistance, maintaining the rotor’s structural integrity over time. The rotor measures 324 mm in outside diameter and 77.1 mm in overall height, with a nominal thickness of 21.8 mm and a discard thickness of 20.4 mm, ensuring precise fitment and performance. The rotor includes five lug holes with a 120 mm bolt circle diameter and a center hole diameter of 75 mm, matching BMW 135i and 135is specifications.

Applications and Problem Solving

• Improves braking performance for BMW 135i and 135is vehicles
• Reduces brake fade caused by heat buildup during aggressive driving
• Enhances pad bite and braking consistency in wet or dusty conditions
• Prevents rotor warping and extends service life through efficient heat dissipation
• Protects against corrosion with coated hat finish for longer durability

Installation Notes and Tips

• Ensure compatibility with BMW 135i and 135is models before installation
• Inspect brake pads and replace if worn to maximize rotor performance
• Follow manufacturer torque specifications for lug nuts and mounting bolts
• Check rotor thickness regularly and replace when reaching discard thickness (20.4 mm)
• Professional installation is recommended for optimal safety and performance

Quality Assurance and Warranty

StopTech Sport Cross-Drilled & Slotted Disc Brake Rotors are manufactured to meet strict quality standards for durability and performance. The rotors undergo rigorous testing to ensure consistent dimensions and material integrity. While specific warranty details are not provided here, StopTech products typically come with a limited warranty against defects in materials and workmanship. Consult the product documentation or manufacturer for exact warranty terms.