Dynamite Friction 830-31117L Disc Brake Rotor - Rear Left

Overview of Dynamite Friction DFC Geoperformance Rotor

The Dynamite Friction DFC Geoperformance Rotor - Drilled and Slotted (part number 830-31117L) 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 xDrive and 330i GT xDrive.

• Nominal thickness: 20 mm with a discard thickness of 18.4 mm
• Vented disc type with drilled and slotted surface for improved cooling
• Directional brake surface optimized for performance and debris removal
• Rust resistant coating to extend rotor life
• Geospec silver grey hat finish for corrosion resistance and aesthetics
• 5 bolt holes with 16.8 mm diameter and 120 mm bolt circle diameter
• Overall diameter of 300 mm and height of 66.3 mm

Detailed Product Features and Specifications

This disc brake rotor is specifically designed for BMW vehicles requiring a 300 mm outside diameter and a 75.05 mm center hole diameter. The vented rotor construction allows for better heat management during braking, reducing the risk of brake fade under demanding conditions. The drilled and slotted surface type improves water and gas evacuation, enhancing braking performance in wet or high-temperature environments. The directional design ensures optimal contact with brake pads, improving stopping power and pad life.

The rotor’s nominal thickness of 20 mm and discard thickness of 18.4 mm provide a clear service life indicator, helping maintain safe braking performance. The rust resistant coating and Geospec silver grey hat finish protect against corrosion, which is especially beneficial for vehicles exposed to harsh weather or road salt.

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 cooling and debris removal capabilities. This product line combines drilled holes and precision slots with vented rotor design to improve braking efficiency and rotor longevity. The directional surface pattern is engineered to optimize pad contact and reduce brake dust buildup, making it suitable for performance-oriented BMW models.

Compatible BMW Models and Applications

• BMW 320i xDrive
• BMW 325xi
• BMW 328d xDrive, 328i, 328i GT xDrive, 328i xDrive, 328xi
• BMW 330e, 330i, 330i GT xDrive, 330i xDrive
• BMW 420i, 428i, 428i Gran Coupe, 428i xDrive, 428i xDrive Gran Coupe
• BMW 430i, 430i Gran Coupe, 430i xDrive, 430i xDrive Gran Coupe
• BMW X1

Common Issues Addressed by This Rotor

• Brake fade caused by excessive heat buildup
• Reduced braking efficiency in wet conditions
• Corrosion and rust on rotor surfaces
• Uneven pad wear due to poor rotor surface design
• Brake noise and vibration from warped or worn rotors

Installation Notes and Tips

Ensure the rotor is installed on compatible BMW models listed above. Verify the bolt hole pattern matches the vehicle’s hub (5 holes, 16.8 mm diameter, 120 mm bolt circle). Clean the rotor surface before installation to remove any protective coatings or residues. Use proper torque specifications for lug nuts to avoid rotor warping. It is recommended to replace brake pads when installing new rotors to maintain optimal braking performance.

Quality Assurance and Warranty

Dynamite Friction manufactures the 830-31117L rotor to meet strict quality standards for durability and performance. The rust resistant coating and precision machining ensure consistent braking under various driving conditions. Warranty details are provided by the manufacturer and should be reviewed prior to installation.