GiroDisc 2-Piece Slotted Front Brake Rotors for 2018+ Subaru WRX STI (A1-185)

Fits 2018+ Subaru WRX STI models equipped with the factory 6-piston Brembo brake system. These high-performance 2-piece rotors are designed as a direct replacement for the heavy factory units, offering significant reductions in unsprung weight and rotating mass to improve handling and acceleration.

The GiroDisc A1-185 system utilizes a lightweight 6061-T6 aluminum center hat paired with a proprietary high-carbon iron disc. This floating design allows the friction surface to expand and contract independently of the hat when subjected to extreme heat, preventing the rotor warping and pedal pulsation common in single-piece designs. The internal 48-vane curved structure acts as a centrifugal pump, pulling cool air through the rotor to maintain consistent stopping power during aggressive driving or track sessions.

• Direct bolt-on replacement for factory front rotors
• Reduces unsprung weight for improved suspension response
• Proprietary high-carbon iron alloy for maximum thermal capacity
• Black anodized aluminum hats for corrosion resistance
• Slotted surface clears brake dust and gases for consistent pad bite
• Fully rebuildable with replaceable rotor rings
• Manufacturer Part Number: A1-185