Dynamite Friction 830-31157L Disc Brake Rotor - Front Left

High-Performance Brake Rotor for BMW and Mini Models

The Dynamite Friction DFC Geoperformance Rotor - Drilled and Slotted (Part Number 830-31157L) is engineered to provide reliable braking performance for select BMW and Mini vehicles. Designed with a vented, directional surface, this rotor enhances heat dissipation and braking consistency under demanding conditions.

• Disc Type: Vented disc brake rotor with drilled and slotted surface
• Outside Diameter: 330 mm for optimal fit and performance
• Nominal Thickness: 24 mm with a discard thickness of 22.4 mm
• Directional surface finish with plain disc and Geospec silver grey hat finish
• Rust resistant coating to extend rotor life
• Bolt Hole Quantity: 5 with 16.6 mm diameter and 112 mm bolt circle diameter
• Center Hole Diameter: 67 mm
• Height: 45.4 mm
• Compatible with BMW 220i, 228i Gran Coupe, 228i xDrive Gran Coupe, Mini Cooper Countryman, X1, and X2

About the DFC Geoperformance Rotor - Drilled and Slotted Line

The DFC Geoperformance Rotor - Drilled and Slotted line by Dynamite Friction focuses on delivering rotors with enhanced heat management and braking efficiency. Featuring a vented design combined with drilled holes and precision slots, these rotors help reduce brake fade and improve pad bite. The directional surface pattern is engineered to optimize water and debris evacuation, making it suitable for both street and light performance driving applications.

Detailed Product Description

This disc brake rotor (Part Number 830-31157L) is constructed with a vented design to improve airflow and heat dissipation during braking. The drilled and slotted surface helps maintain clean pad contact by channeling away dust, gases, and moisture. The rotor’s plain disc finish paired with a Geospec silver grey hat finish provides corrosion resistance and a durable appearance. With a nominal thickness of 24 mm and a discard thickness of 22.4 mm, this rotor meets strict specifications for safe and effective braking. The 5-bolt hole pattern with a 112 mm bolt circle diameter ensures precise fitment on compatible BMW and Mini models.

Applications and Problem Solving

• Reduces brake fade during extended or aggressive braking
• Improves braking response and pad bite with slotted and drilled surface
• Helps prevent rotor warping by enhancing heat dissipation
• Resists rust and corrosion for longer service life
• Compatible with BMW 220i, 228i Gran Coupe, 228i xDrive Gran Coupe, Mini Cooper Countryman, X1, and X2 models

Installation Notes and Tips

Ensure the rotor is installed on vehicles with the correct 5-lug bolt pattern and 112 mm bolt circle diameter. The directional surface requires installation with the rotation direction matching the vehicle’s wheel rotation for optimal performance. Check rotor thickness before installation and replace if below the discard thickness of 22.4 mm. Use proper torque specifications for lug nuts to avoid rotor damage.

Quality Assurance

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 to extend service life. Please refer to Dynamite Friction’s warranty policy for coverage details.