Porsche 991 GT3, GT2RS, GT4RS PCCB Front Iron Rotor Conversion

The Girodisc PCCB Front Iron Rotor Conversion is the ultimate solution for Porsche 991 GT3, GT2RS, and 718 GT4RS owners looking to replace costly carbon ceramic rotors with a lightweight, high-performance iron alternative. Designed for seamless fitment and OEM compatibility, this system delivers improved braking feel, durability, and cost efficiency without compromising your Porsche’s balance or factory performance.

Direct PCCB Replacement for Track-Focused Drivers

This conversion system is a direct replacement for Porsche’s PCCB (carbon ceramic) rotors, using the same pad shape as 991 GT3 models equipped with factory iron brakes. The smaller pad annulus keeps overall rotor weight reasonable while improving pad selection options for street, track, or endurance setups. Unlike oversized PCCB-equivalent rotors, Girodisc’s optimized annulus design maintains proper mass distribution for responsive, consistent braking performance.

Vehicle Fitment

These Girodisc PCCB Front Iron Rotor Conversions are engineered specifically for:

• Porsche 991 GT3 (PCCB-equipped)
• Porsche 991 GT3 RS (PCCB-equipped)
• Porsche 991 GT2 RS (PCCB-equipped)
• Porsche 718 GT4 RS (PCCB-equipped)

Compatible with both 991.1 and 991.2 models originally fitted with Porsche Carbon Ceramic Brakes (PCCB).

Features

The rotor hat is CNC-machined from U.S.-sourced 6061-T6 aircraft-grade aluminum for strength and reduced unsprung weight. The rotor rings are made from Girodisc’s proprietary cast iron alloy, poured and machined entirely in-house in the USA. Each disc features a curved vane internal design that acts as a centrifugal pump, forcing cooling air through the rotor to reduce temperatures and improve fade resistance under extreme use.

The floating mount system employs 12 high-strength alloy steel drive pins, cadmium plated for long-lasting corrosion resistance and secured by class 12.9 cap screws with hardened washers. Anti-noise spring washers allow the rotors to expand with heat while eliminating the rattle often associated with floating rotors. The floating setup also ensures the rotor self-centers between the pads, maintaining consistent pedal feel and precision braking feedback.

Once installed, the Girodisc system allows future rotor replacements to be quick and cost-effective — simply replace the iron rings while retaining your original aluminum hats. This keeps long-term maintenance costs low while providing exceptional stopping performance for street and track use alike.

Sold and priced in pairs.

FAQs: Porsche 991 GT3, GT2RS, GT4RS PCCB Front Iron Rotor Conversion

Will these fit my PCCB-equipped Porsche? Yes. They are designed to replace the factory PCCB rotors directly. You’ll just need to use the smaller iron pad shape from 991 GT3 models with iron brakes.

Why switch from PCCB to iron rotors? Iron rotors offer superior heat dissipation, better pedal feel, and dramatically reduced replacement costs compared to PCCBs, making them ideal for frequent track drivers.

Do I need to modify anything for installation? No modifications are required. The Girodisc rotors bolt directly to your existing hubs and calipers, maintaining all factory geometry and electronics.

How do these compare in weight to PCCBs? They are slightly heavier, but the difference is offset by improved cooling, reduced fade, and greater brake pad compatibility — critical benefits for extended track sessions.

Can I reuse the aluminum hats? Absolutely. When the rotors wear out, simply install new Girodisc iron rings onto your existing hats, making replacements quick and economical.

Upgrade your Porsche’s braking system with the Girodisc PCCB Front Iron Rotor Conversion — precision-engineered in the USA for drivers who demand consistent, fade-free performance lap after lap.