Girodisc Porsche 718 GTS 4.0 / 981 Spyder Rear Rotors (with Spacers & Bolts)
The Girodisc A2-049B Rear Rotor Kit delivers high-performance braking and improved cooling for Porsche 718 GTS 4.0 and 981 Spyder models. Designed as a direct replacement for the OE discs, this 2-piece floating rotor system includes caliper spacers and longer bolts for easy installation of the larger diameter rotors. The result is enhanced braking torque, reduced unsprung mass, and a significant upgrade in heat dissipation—all while maintaining factory balance and ABS function.
Precision Engineering & Lightweight Performance
Each rotor features a CNC-machined 6061-T6 aluminum hat mated to Girodisc’s proprietary cast iron ring, ensuring optimal strength and weight reduction. The 2-piece floating design reduces rotational inertia and improves handling response. The rotor’s curved vane internal design acts as a centrifugal pump, channeling air through the disc to maximize cooling efficiency during hard use on the street or track.
Floating Mount System & Quiet Operation
The Girodisc floating mount system uses 10 high-strength alloy steel drive pins manufactured in-house in the USA. These pins, cadmium-plated for corrosion resistance, connect the rotor ring to the aluminum hat via class 12.9 cap screws and hardened washers. Anti-noise spring washers allow thermal expansion while eliminating unwanted rattles—offering a race-proven floating design that’s quiet enough for everyday driving.
Vehicle Fitment
- Porsche 718 GTS 4.0
- Porsche 981 Spyder
- Includes spacers and longer bolts for installation
- Requires 991 Carrera S/4S/GTS rear pad shape for full pad sweep
- Direct bolt-on replacement, no modifications required
Technical Specifications
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CMS Number: A2-049B
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Position: Rear
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Rotor Diameter: 350mm (includes spacers & bolts)
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Design: 2-piece floating assembly
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Material: Proprietary cast iron rotor ring with 6061-T6 aluminum hat
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Vane Design: Curved directional vanes for efficient air cooling
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Hardware: Cadmium-plated drive pins, class 12.9 cap screws, anti-noise washers
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Rebuildable: Yes — replace rotor rings and reuse hats
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Sold/Price: Per pair
FAQs for Girodisc A2-049B
Do these rotors require modifications? No. The kit includes caliper spacers and longer bolts, allowing for direct installation with OEM calipers.
What brake pads should I use? Use the 991 Carrera S/4S/GTS rear pad shape for complete pad sweep across the larger rotor surface.
Are these rotors quieter than typical floating designs? Yes. Girodisc’s anti-noise spring washers ensure smooth, silent operation during street and track use.
Can the rings be replaced? Yes. These rotors are fully rebuildable with replacement rings available from Girodisc.
Upgrade your Porsche 718 GTS 4.0 or 981 Spyder with Girodisc A2-049B Rear Rotors for reduced unsprung weight, improved cooling, and consistent braking performance lap after lap.
