Dynamite Friction 830-31109L Disc Brake Rotor - Rear Left

Overview of Dynamite Friction DFC Geoperformance Rotor

The Dynamite Friction DFC Geoperformance Rotor - Drilled and Slotted (part number 830-31109L) is engineered for BMW models including the 328i, 330i, 335i, 340i, 428i, 430i, 435i, 440i, and ActiveHybrid 3. Designed to enhance braking performance, this vented disc brake rotor features a directional, drilled and slotted surface for improved heat dissipation and consistent stopping power.

• Part Number: 830-31109L
• Compatible with multiple BMW models including 328i, 335i xDrive, 430i Gran Coupe, and more
• Vented disc brake rotor with drilled and slotted surface
• Nominal thickness: 20 mm; discard thickness: 18.4 mm
• Overall diameter: 330 mm; height: 66.4 mm
• Rust resistant coating with Geospec silver grey hat finish
• 5 bolt holes with 16.8 mm diameter and 120 mm bolt circle diameter
• Directional brake surface for optimized performance

DFC Geoperformance Rotor - Drilled and Slotted Product Line

The DFC Geoperformance Rotor - Drilled and Slotted line by Dynamite Friction focuses on rotors that combine drilled holes and precision slots to improve brake pad bite and reduce heat buildup. This product line is designed to provide enhanced braking consistency and fade resistance, particularly suited for performance-oriented BMW vehicles. The directional surface pattern and vented rotor design work together to maintain optimal operating temperatures during demanding driving conditions.

Technical Specifications and Features

This disc brake rotor features a nominal thickness of 20 mm and a discard thickness of 18.4 mm, ensuring a long service life before replacement is necessary. The rotor’s outside diameter measures 330 mm with an overall height of 66.4 mm, fitting precisely on compatible BMW models. The rotor is vented to allow better airflow and heat dissipation, reducing the risk of brake fade during extended use.

The surface type is both slotted and drilled, which helps to evacuate gases and debris from the brake pad surface, improving contact and braking efficiency. The rotor’s hat is finished in Geospec silver grey, providing corrosion resistance along with a rust resistant coating applied to the entire rotor. The 5 bolt holes, each 16.8 mm in diameter, are arranged on a 120 mm bolt circle diameter, matching the stud/lug hole pattern of the specified BMW models.

Applications and Problem Solving

• Improves braking performance on BMW 328i, 335i xDrive, 430i Gran Coupe, and other compatible models
• Reduces brake fade during aggressive or extended braking
• Helps prevent rotor warping caused by excessive heat
• Minimizes brake dust and debris buildup with slotted and drilled design
• Protects against rust and corrosion for longer rotor life

Installation Notes and Tips

Ensure the rotor is installed on compatible BMW models listed in the fitment section. Verify the bolt hole pattern and rotor dimensions before installation. It is recommended to replace brake pads simultaneously to maintain optimal braking performance. Clean the rotor surface of any protective coatings or oils before installation to prevent brake noise or reduced friction. Proper torque specifications should be followed when securing the rotor to the hub.

Quality Assurance and Warranty

Dynamite Friction manufactures the DFC Geoperformance Rotor - Drilled and Slotted to meet or exceed OEM standards for fit, form, and function. The rotor includes a rust resistant coating and durable finishes to extend service life. Warranty information is available from the manufacturer and should be consulted for specific coverage details.