Girodisc Porsche 991 GT3 Rear Rotors
Designed for the demanding performance of the 991 GT3 and GT3 RS, these Girodisc rear rotors provide a lighter, stronger, and more heat-efficient upgrade over factory iron rotors. Built for drivers who push their cars to the limit, they offer exceptional pedal feel, cooling performance, and precision without altering OEM brake balance or ABS function.
Vehicle Fitment
Porsche 911 GT3 (991.1 & 991.2)
Porsche 911 GT3 RS (991.1 & 991.2)
Compatible with OEM iron rotor systems and factory calipers.
Precision-Built for Track and Street Use
The Girodisc system bolts directly to the factory hubs and calipers—no modifications or pad changes required. Each rotor features a CNC-machined 6061-T6 aluminum hat paired with Girodisc’s proprietary high-carbon cast-iron friction ring. The two-piece floating design allows for thermal expansion without warping, keeping braking consistent during intense heat cycles. Curved internal vanes act as centrifugal pumps to force cooling air through the disc, extending rotor life and minimizing fade.
Features
• Direct replacement for OEM iron rear rotors—no modifications required
• Billet 6061-T6 aluminum hats with anodized finish
• Proprietary high-carbon cast-iron rings, cast and machined in the USA
• Floating mount system with cadmium-plated drive pins and anti-noise washers
• Curved internal vane design improves airflow and cooling
• Maintains factory brake balance and ABS efficiency
• Fully rebuildable—replace only the iron rings when worn
• Sold/priced per pair
Girodisc A2-146 Rear Rotor FAQs:
Do these fit both the 991 GT3 and GT3 RS? Yes. They’re designed specifically for OEM iron rotor-equipped 991 GT3 and GT3 RS models and work with stock Brembo calipers.
Do I need to change my brake pads or hardware? No. Unlike many aftermarket systems, Girodisc rotors retain full compatibility with OEM pads and hardware.
What kind of performance gain should I expect? Expect reduced unsprung mass, better cooling efficiency, and improved pedal consistency under heavy braking conditions.
Are these rotors suitable for track use? Absolutely. The floating two-piece construction and curved vane cooling make them ideal for extended track sessions or spirited driving on twisty roads.
Bring race-proven braking precision to your Porsche 991 GT3 with Girodisc’s rear rotors—crafted for balance, responsiveness, and reliability at any speed.
