Dynamite Friction 830-31070L Disc Brake Rotor - Rear Left

Overview of Dynamite Friction DFC Geoperformance Rotor

The Dynamite Friction DFC Geoperformance Rotor - Drilled and Slotted (part number 830-31070L) is engineered for BMW models including the 330i, 330xi, 335d, 335i, 335is, 335i xDrive, 335xi, and X1. This vented disc brake rotor combines drilled and slotted surface features to enhance braking performance and heat dissipation.

• Part Number: 830-31070L
• Compatible with BMW 330i, 330xi, 335d, 335i, 335is, 335i xDrive, 335xi, and X1
• Disc Finish: Plain with Geospec silver grey hat finish
• Surface Type: Directional drilled and slotted design
• Vented rotor for improved heat management
• Rust resistant coating for extended durability
• Dimensions: 336 mm outside diameter, 67.2 mm overall height
• Bolt Pattern: 5 lug holes with 14.8 mm diameter, 120 mm bolt circle diameter
• Nominal Thickness: 22 mm; Discard Thickness: 20.4 mm

Detailed Product Description

The DFC Geoperformance Rotor - Drilled and Slotted by Dynamite Friction is designed to meet the braking demands of various BMW models. Featuring a vented rotor construction, it allows for efficient heat dissipation during braking, reducing the risk of brake fade. The directional drilled and slotted surface improves water and debris evacuation, enhancing wet weather braking performance and pad bite. The rotor’s plain disc finish paired with a Geospec silver grey hat finish provides corrosion resistance and a clean appearance.

With a nominal thickness of 22 mm and a discard thickness of 20.4 mm, this rotor maintains structural integrity throughout its service life. The 5-lug bolt pattern with a 120 mm bolt circle diameter and 14.8 mm bolt hole diameter ensures precise fitment on compatible BMW models. The rust resistant coating further protects the rotor from environmental elements, extending its operational lifespan.

Applications and Problem Solving

• Replacement rotor for worn or warped rotors on BMW 330i, 335i, and X1 models
• Improves braking performance in wet and dry conditions with drilled and slotted design
• Reduces brake fade during aggressive driving or heavy braking scenarios
• Prevents rust and corrosion buildup for longer rotor life
• Restores proper rotor thickness and surface condition for consistent braking

Installation Notes and Tips

• Ensure rotor thickness is above discard thickness (20.4 mm) before installation
• Clean rotor surface and hub mounting area to prevent uneven wear
• Use proper torque specifications for 5-lug bolts with 14.8 mm diameter
• Check compatibility with specific BMW model and year before installation
• Inspect brake pads for wear and replace if necessary to optimize performance

Quality Assurance

Dynamite Friction’s DFC Geoperformance Rotor line is manufactured to meet OEM specifications for fit, form, and function. The rust resistant coating and vented design contribute to durability and consistent braking performance. While no specific warranty information is provided, Dynamite Friction products are engineered for reliable service in demanding automotive applications.