Dynamic Friction 4522-31087 GeoSpec Coated Plain Disc Brake Rotor

The Dynamic Friction Company (DFC) GeoSpec Coated Plain Disc Brake Rotor (4522-31087) delivers OE-quality stopping performance wrapped in DFC's patented corrosion-resistant finish. Engineered as a direct OEM replacement, this plain-style rotor is built to match the precise form, fit, and function of the original equipment part it replaces.

DFC's GeoSpec coating forms a durable, attractive silver-gray finish that provides superior rust protection compared to conventional zinc or paint coatings. The coating is applied inside and out — covering the hat, vanes, and edges — for comprehensive protection before and after installation. On the friction surfaces, the coating is safely swept away by the brake pads during normal break-in with no harmful effects on braking performance.

Key Features:

• Patented GeoSpec corrosion-resistant coating — outperforms conventional zinc and paint finishes in salt spray testing
• Engineered with premium G3000/G11H18 iron castings for strength, stability, and long-term durability
• OE vane configuration ensures proper and maximum heat dissipation
• CNC-machined to tight tolerances for precise fitment and consistent pedal feel
• 100% mill-balanced for vibration-free stopping at any speed
• Non-directional surface finish promotes faster, more even brake pad bed-in and quieter stops
• Processed dry, shipped dry — ready to install straight out of the box with no cleaning required
• Plain (smooth) rotor surface — ideal OE replacement style

Because GeoSpec rotors require no pre-installation cleaning or prep, they reduce installation time and eliminate the hassle associated with uncoated rotors that develop surface rust on the shelf. This makes them an excellent choice for both professional technicians and DIY installers looking for a quality, long-lasting brake rotor upgrade.