Dynamite Friction 830-31089L Disc Brake Rotor - Front Left

Overview of Dynamite Friction DFC Geoperformance Rotor

The Dynamite Friction DFC Geoperformance Rotor - Drilled and Slotted (part number 830-31089L) is engineered for precision braking performance on select BMW models. Designed with a vented, directional surface, this rotor enhances heat dissipation and braking consistency for vehicles such as the BMW 320i, 328i xDrive, and 430i Gran Coupe.

• Disc type: Vented disc brake rotor
• Surface finish: Slotted and drilled for improved heat and gas dissipation
• Rust resistant coating for extended durability
• Directional brake surface optimized for performance
• Hat finish in Geospec silver grey for corrosion resistance
• Overall diameter: 312 mm with 5 bolt holes (14.5 mm diameter)
• Nominal thickness: 23.8 mm; discard thickness: 22.4 mm
• Bolt circle diameter: 120 mm

DFC Geoperformance Rotor - Drilled and Slotted Product Line

The DFC Geoperformance Rotor - Drilled and Slotted line by Dynamite Friction focuses on delivering rotors with enhanced thermal management and braking efficiency. Featuring a combination of drilled holes and precision slots, these rotors help reduce brake fade by allowing gases and heat to escape more effectively. The vented design further supports cooling, making this rotor suitable for BMW models requiring reliable stopping power under varied driving conditions.

Detailed Product Description

This disc brake rotor is specifically designed for BMW vehicles including the 220i, 228i xDrive, 328d, 330i GT xDrive, and X1 among others. The rotor’s 312 mm outside diameter and 73.6 mm overall height ensure proper fitment and compatibility. The directional slotted and drilled surface improves pad bite and helps maintain consistent braking performance by minimizing heat buildup. The rotor’s hat is finished in Geospec silver grey, providing corrosion resistance and a clean appearance. Additionally, the rust resistant coating extends the rotor’s service life by protecting against environmental elements.

Applications and Problem Solving

• Reduces brake fade during aggressive or prolonged braking
• Improves heat dissipation to prevent rotor warping
• Enhances braking response and pad bite on BMW 320i and 328i xDrive models
• Minimizes rust and corrosion for longer rotor lifespan
• Maintains consistent braking performance in wet or dry conditions

Installation Notes and Tips

Ensure the rotor is installed on compatible BMW models listed in the fitment section. Verify the bolt hole pattern (5 holes, 14.5 mm diameter, 120 mm bolt circle) matches your vehicle’s hub. Clean the rotor surface before installation to remove any protective coatings or residues. Proper torque specifications should be followed to avoid rotor distortion. Directional rotors must be installed with the correct rotation direction for optimal performance.

Quality Assurance

Dynamite Friction manufactures the 830-31089L rotor to meet OEM standards for fit, form, and function. The rust resistant coating and Geospec silver grey hat finish contribute to durability and corrosion resistance. While no specific warranty information is provided, this rotor is engineered for reliable performance on BMW vehicles including the 220i, 328i, and 430i Gran Coupe.