Dynamite Friction 830-31047L Disc Brake Rotor - Rear Left

Overview of Dynamite Friction DFC Geoperformance Rotor

The Dynamite Friction DFC Geoperformance Rotor - Drilled and Slotted (part number 830-31047L) is engineered for BMW 323i, 325Ci, 325i, 328Ci, and 328i models. This vented disc brake rotor features a directional, slotted and drilled surface designed to enhance braking performance and heat dissipation.

• Compatible with BMW 323i, 325Ci, 325i, 328Ci, and 328i
• Part number: 830-31047L
• Directional, slotted and drilled surface for improved braking
• Vented rotor design for heat management
• Rust resistant coating for durability
• Nominal thickness: 19 mm; discard thickness: 17.4 mm
• Outside diameter: 294 mm; overall height: 59.7 mm
• 5 bolt holes with 14.6 mm diameter and 120 mm bolt circle diameter
• Hat finish in Geospec silver grey

Product Line Details: DFC Geoperformance Rotor - Drilled and Slotted

The DFC Geoperformance Rotor - Drilled and Slotted line by Dynamite Friction is designed to provide enhanced braking efficiency through a combination of drilled holes and precision slots. This design aids in gas and dust evacuation, reducing brake fade and maintaining consistent performance under demanding conditions. The vented rotor construction further supports heat dissipation, making it suitable for BMW vehicles requiring reliable stopping power.

Technical Specifications and Features

This disc brake rotor features a nominal thickness of 19 mm and a discard thickness of 17.4 mm, ensuring a long service life before replacement is necessary. The rotor’s outside diameter measures 294 mm, with an overall height of 59.7 mm. It includes five bolt holes, each with a diameter of 14.6 mm, arranged on a 120 mm bolt circle diameter, matching the fitment requirements of specified BMW models. The rotor surface is finished plain, while the hat is coated in Geospec silver grey, providing corrosion resistance enhanced by an additional rust-resistant coating.

Applications and Problem Solving

• Replacement rotor for worn or warped discs on BMW 323i, 325Ci, 325i, 328Ci, and 328i
• Improves heat dissipation to reduce brake fade during aggressive driving
• Slotted and drilled surface helps evacuate brake dust and gases for consistent braking
• Rust resistant coating extends rotor life in corrosive environments
• Vented design supports cooling to maintain braking performance

Installation Notes and Tips

Ensure the rotor thickness is above the discard thickness of 17.4 mm before installation. Clean the rotor surface to remove any protective coatings or residues prior to mounting. Verify bolt hole alignment with the vehicle’s hub using the 5-bolt, 120 mm bolt circle pattern. Proper torque specifications should be followed to avoid rotor warping. Directional rotors must be installed with the correct rotation direction for optimal performance.

Quality Assurance and Warranty

Dynamite Friction manufactures the DFC Geoperformance Rotor - Drilled and Slotted to meet OEM standards for fit and function. The rotor includes a rust-resistant coating to enhance durability. Warranty details are provided by the manufacturer and should be confirmed at the time of purchase.