Porsche 991.1 S, 4S, GTS Front Rotors
The Girodisc 2-piece floating rotor system is a direct replacement for the factory rotors on the Porsche 991.1 Carrera S, 4S, and GTS. This upgrade includes precision caliper spacers that allow the installation of larger 350 mm rotors in place of the factory 340 mm discs, resulting in increased braking torque, improved cooling, and reduced fade under demanding conditions. The Girodisc rotors weigh approximately 21.0 lbs each, compared to the 24.4 lbs OEM units—reducing rotational mass for sharper acceleration and suspension response.
Each rotor features a CNC-machined 6061-T6 aluminum hat bolted to Girodisc’s proprietary high-carbon cast-iron rings. The internal curved vane design functions as a centrifugal air pump, pulling cool air through the disc to efficiently dissipate heat during high-performance driving. Engineered and manufactured entirely in the USA, Girodisc rotors deliver exceptional braking consistency and reliability on both street and track.
Precision-Engineered Performance
Vehicle Fitment
- Porsche 991.1 Carrera S
- Porsche 991.1 Carrera 4S
- Porsche 991.1 Carrera GTS
Features
-
Direct replacement with included spacers: Increases rotor size to 350 mm for enhanced braking force and heat management.
-
Lightweight construction: 21.0 lbs per rotor versus 24.4 lbs OEM reduces unsprung and rotational weight.
-
Curved vane design: Actively circulates air through the rotor for superior cooling and fade resistance.
-
Floating mount system: Cadmium-plated steel drive pins and anti-noise spring washers manage thermal expansion while eliminating rattle.
-
Serviceable two-piece design: Replace only the iron rings when worn for reduced long-term cost.
-
Made in the USA: Cast, machined, and assembled entirely in-house for unmatched quality control.
FAQs
Will these work with OEM calipers? Yes. Girodisc rotors are designed to work perfectly with stock calipers and come with spacers for proper fitment.
Do I need to change brake pads? No. You can continue using your current OEM or aftermarket pads.
Are these suitable for track use? Yes. The curved vane design and floating assembly ensure consistent braking under extreme temperatures.
Do they affect ABS or brake balance? No. Factory brake bias and ABS functionality remain unchanged.
How are they sold? Sold and priced per pair.
Upgrade your 991.1 Carrera with Girodisc’s 350 mm floating rotors for improved cooling, reduced fade, and sharper pedal feel—engineered for performance driving enthusiasts.
