DFC Hi-Carbon Alloy Geomet Coated Front Brake Rotor for Select 2018-2026 BMW and Toyota GR Supra

Fits select 2018-2026 BMW 230i, 330i, 330e, 430i, i4, X3, X4, Z4, and 2021-2024 Toyota GR Supra.

This DFC Hi-Carbon Alloy brake rotor (MPN 900-31171) is engineered for drivers who demand superior thermal stability and long-term durability. Constructed from premium G3000/G11H18 iron castings, the high-carbon metallurgy offers enhanced heat dissipation and increased resistance to thermal cracking compared to standard iron. This material composition is specifically chosen to reduce brake noise and ensure a consistent pedal feel under various driving conditions.

To combat road salt and environmental moisture, each rotor is Geomet® coated for professional-grade corrosion resistance. Every unit is 100% precision mill-balanced to eliminate zero vibration at any speed, while the 16 RMS fine-turned finish ensures a smooth interface for faster brake pad bed-in. Engineered with an Original Equipment (OE) vane configuration, these rotors maintain factory-specified cooling efficiency.

• Manufacturer Part Number: 900-31171
• Cast from G3000/G11H18 high-carbon alloy for superior strength
• Geomet® coating for long-lasting corrosion protection
• Precision mill-balanced to ensure zero vibration
• Lateral runout: 0.050mm maximum
• Disc thickness variation (DTV): 0.010mm maximum
• Fine-turned 16 RMS finish for optimal pad break-in
• OE-matched vane configuration for maximum heat dissipation