GiroDisc A2-146 2-Piece Rear Brake Rotors for Porsche 991 GT3/GT3RS/GT2RS

Vehicle Fitment

• Porsche 911 GT3 (991), Rear
• Porsche 911 GT3 RS (991), Rear
• Porsche 911 GT2 RS (991), Rear

Fitment Notes

• For cars with OEM steel/iron rotors ONLY - excludes PCCB (Porsche Ceramic Composite Brake) equipped cars, which require a different Girodisc PCCB conversion product
• Allows continued use of factory unmodified brake pads - unlike most aftermarket rotor solutions for this application
• If your car has factory center lock wheels, select the center lock drive pin option when ordering
• Direct OE replacement - bolts to factory calipers with no modifications required
• Sold and priced per pair

Features

• Maintains factory brake bias and ABS functionality - unlike a big brake kit swap
• Central hat machined from U.S.-sourced 6061-T6 aircraft-spec aluminum
• Disc cast from GiroDisc's proprietary iron, poured and machined entirely in-house in the USA
• Curved vane design acts as a centrifugal pump for improved cooling airflow
• Floating mount system with 10 cadmium-plated alloy steel drive pins
• Anti-noise spring washers eliminate cold rattle while allowing thermal expansion
• Replace only the cast iron disc ring when worn - reuse the aluminum hat

Specifications

• Position: Rear
• Type: 2-Piece Floating Rotor
• Hat Material: 6061-T6 Aircraft-Spec Aluminum
• Disc Material: Proprietary Cast Iron
• Drive Pins: 10x Alloy Steel, Cadmium Plated

Included Components

• 2x 2-Piece Rear Brake Rotor Assembly

Product Description

GiroDisc's 2-piece rotor system replaces the heavy factory rear rotor on the 991 GT3/GT3RS/GT2RS with a lighter floating aluminum-hat/cast-iron-disc assembly, cutting rotational and unsprung weight without touching factory brake bias or ABS calibration. Unlike most aftermarket rotor options for this platform, it keeps compatibility with the factory unmodified pad - no need to switch pad compounds just to run the new rotor.

The floating mount lets the disc expand with heat while staying quiet when cold, and when the iron disc eventually wears, only that ring needs replacing - the aluminum hat is reusable. It's a track-focused upgrade for GT3/GT3RS/GT2RS owners running factory iron brakes who want lighter, more consistent rear stopping power without a full big brake kit.