Girodisc Rear 390mm 2-piece Rotor Upgrade
The Girodisc system is a direct replacement for the OE disc on GT4 models with the OEM PCCB rotors. No modifications are necessary, allows use of factory unmodified pads unlike most aftermarket solutions for this application. The disc will bolt directly to the car and work with OE calipers perfectly. By upgrading your brakes with lightweight high performance replacements as opposed to a big brake kit, your factory bias is maintained as well as your ABS efficiency.
The central hat section of the Girodisc rotor is made from strictly U.S. sourced 6061-T6 aircraft specification aluminum. The disc is made from our own proprietary cast iron, poured in the USA and machined from start to finish in house at Girodisc. The rotor utilizes a curved vane design, developed in racing to act as a centrifugal pump to force cooling air through the disc.
The rotor and hat have a floating mount system, which utilizes 8 or 10 high strength alloy steel drive pins, manufactured by Girodisc in the USA to our own specifications and cadmium plated for a long lasting corrosion resistance. These pins take the load from braking actions while maintaining the axial and radial float between the hat and disc. The pins are secured by grade 12 cap screws with hardened washers. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise spring washers on the rotor side which allow the rotor to grow with heat expansion but eliminate the rattle and noise associated with floating rotors. This float also allows the rotor to self center between the pads.
Fits the following models:
- Cayman GT4 models with Ceramic Brake System PCCB
- 2021-2024 Boxster Spyder models with Ceramic Brake System PCCB
- 2017-2019 911 Carrera models with PCCB (including S, 4, 4S, T, & Targa)
- 2020-2024 911 Carrera, T, S, & 4S models with PCCB
Dimensions: 390 x 32 mm. 2-Piece design. Comes with the left and right front rotor. Made by Girodisc. Intended for off road use only. Professional installation required. Racing brake discs need to be regularly inspected by certified mechanics.
NOTE: Brake pads listed below are recommended for these rotors.
Add Girodisc Brake Pads:
GP35 Track Pads
GP35 compound combines the best of both worlds into one all-around race pad. We took some of the longevity of our endurance pads, some of the bite of our sprint pads, and worked to develop a compound that can do it all. As a bonus, it’s easy to bed, which means less time figuring your brakes out, and more time driving on the track.
The GP35 is designed to work with street car ABS as well as motorsport-grade ABS found in factory-built race cars. The torque curve is designed to be smooth and linear, which leads to superior modulation and release under trail braking. These pads work with a wide range of tires, from DOT street tires to R-compounds to full race slicks.
It has become our most popular compound and is the compound we recommend most frequently to track day drivers and shops running cars in professional racing series.
GP10 Street Pads
Designed for performance-minded drivers, our GP10 semi-metallic brake pads strike the perfect balance between daily drivability and occasional track use. Optimized for street conditions, they offer a quiet, lower-dust experience without sacrificing the confident stopping power you need when the pace picks up.
Whether you're navigating traffic or hitting the occasional track day, these pads deliver a responsive pedal feel, excellent heat resistance, and consistent braking performance. Built for longevity and reliability, they’re the ideal upgrade for enthusiasts who want everyday comfort with the capability to push harder when it counts.
For drivers planning extensive track sessions or more aggressive track driving, we recommend considering our dedicated race pads, engineered to handle the extreme heat and demands of frequent high-performance track use.
