Girodisc Porsche GT3 Front Rotors

The Girodisc system is a direct replacement for the OE front rotors on all Porsche 996 and 997.1 GT3 and GT2 models. No modifications are required—the discs bolt directly to the car and work perfectly with OE calipers. This upgrade offers a lighter, high-performance braking solution that maintains factory brake bias and ABS calibration while improving cooling and response. The Girodisc front rotors weigh approximately 21.0 lbs each, compared to 25.6 lbs for the stock units—a significant reduction in unsprung and rotational mass that enhances acceleration and suspension dynamics.

High-Performance Construction

The central hat section is crafted from U.S.-sourced 6061-T6 aircraft-grade aluminum for strength and lightness. The rotor rings are Girodisc’s proprietary cast iron, poured and machined entirely in-house in the USA. The curved vane design, developed through years of motorsport experience, acts as a centrifugal pump that forces air through the disc, reducing heat build-up and maintaining consistent braking performance under extreme conditions.

Girodisc A1-019 Features

• Direct bolt-on replacement for OE rotors—no modifications required
• Lightweight two-piece floating design improves cooling and reduces rotational mass
• 6061-T6 aluminum hat and proprietary high-carbon iron rotor rings
• Curved vane design for efficient cooling airflow
• Floating mount system allows thermal expansion while preventing warping
• Cadmium-plated drive pins for long-lasting corrosion resistance
• Quiet operation thanks to anti-noise spring washers
• Fully rebuildable—replace iron rings while reusing hats and hardware

Vehicle Fitment

• Porsche 996 GT3 (2004–2005)
• Porsche 996 GT2 (2002–2005)
• Porsche 997.1 GT3 (2006–2008)
• Porsche 997.1 GT3 RS (2007–2008)

Note: Designed for iron brake systems. Not compatible with PCCB carbon-ceramic rotors.

Technical Specifications

• Part Number: A1-019
• Position: Front
• Weight: 21.0 lbs (each)
• OE Weight: 25.6 lbs (each)
• Rotor Type: Two-piece floating
• Hat Material: 6061-T6 aluminum, anodized
• Disc Material: Girodisc proprietary high-carbon cast iron
• Vane Design: Curved, directional
• Drive Pins: 10 high-strength alloy steel, cadmium-plated
• Hardware: Class 12.9 cap screws with hardened washers
• Sold/Price: Per pair

Girodisc A1-019 FAQs

Do I need to modify the calipers or hubs? No. These rotors are a direct replacement for the factory discs and bolt up with OEM hardware.

Will they make noise during street driving? No. Girodisc uses anti-noise spring washers to allow float while keeping the system quiet for street use.

Are the rings replaceable? Yes. Replacement rings can be purchased separately, allowing you to reuse the aluminum hats and hardware.

Can these handle track use? Absolutely. These rotors are engineered to endure repeated high-heat cycles without cracking or warping, making them ideal for both spirited street and track driving.

Upgrade your GT3’s stopping power with Girodisc’s lightweight, precision-engineered front rotors—built for performance, endurance, and control.