The GiroDisc rotors for 981 GT4 / Boxster Spyder convert your brake system from expensive OEM rotors to a high-performance, track-ready set of iron rotors with improved cooling, strength, and consistency. These two-piece floating rotors feature a lightweight aluminum hat and cast-iron braking surface engineered to deliver stronger stopping power under heavy use, reduced unsprung weight for improved suspension response, and enhanced heat dissipation to resist fade — ideal for spirited driving or track days without sacrificing daily drivability.
Engineered to fit Porsche 997.1 Turbo (OEM PCCB), 981 Cayman GT4 & 981 Boxster Spyder (OEM Iron Rotors) — acts as a direct replacement for OEM rotors.
Bolts directly to OEM hubs and works with factory calipers — no custom fabrication or caliper replacement required.
Intended for street, track, or mixed-use — gives reliability and performance whether you’re pushing the car hard or using it daily.
Two (2) two-piece floating rotors — each with a cast-iron braking surface and 6061-T6 aluminum “hat.”
Floating-mount hardware including alloy drive pins and special anti-noise spring washers (to allow thermal expansion without rotor “rattle”).
Installation kit to reuse OEM calipers, pads, and hubs — rotor swap is bolt-on and uses factory mounting points.
Rotor structure: Two-piece rotor (cast-iron disc + aluminum hat) for optimized strength, durability, and weight savings.
Cooling design: Curved-vane internal ventilation that acts like a centrifugal pump to draw cooling air through the disc — improves heat rejection and reduces fade during extended heavy braking.
Floating mount system: Allows the disc to expand/contract independently from the hat under heat — maintains pad centering, reduces stress on caliper hardware, and improves rotor longevity.
Weight & unsprung-mass benefit: Lighter hat + optimized design reduces rotational and unsprung mass compared to stock rotor setups, improving suspension response and handling dynamics.
Superior Brake Performance & Cooling — The ventilated, floating design with curved-vane cooling dramatically improves heat dissipation and reduces brake fade under heavy loads or track use.
Reduced Unsprung & Rotational Weight — Aluminum hat and two-piece design cut mass, enhancing suspension feedback, responsiveness, and overall vehicle agility.
Direct OEM-Fitment & Caliper Compatibility — Installs using factory hubs, calipers and brake lines — no additional parts or modifications required.
Floating Rotor Design — Allows thermal expansion, self-centering, and improved rotor longevity while maintaining firm brake pedal feel.
Cost-Effective Alternative — Offers performance and durability of OEM brakes but at a fraction of the replacement cost — ideal for track days or aggressive driving.
Long Service Life & Racetrack Proven — Built with high-quality materials and engineering, designed to take repeated laps, hard braking, and temperature swings with consistency and durability.
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