GiroDisc A1-154 2-Piece Slotted Front Rotors for Porsche 991 GT3 / GT2RS / GT3RS

Vehicle Fitment

• Front axle - Porsche 911 (991) GT3, GT3 RS, GT2 RS equipped with PCCB (carbon-ceramic) stock rotors
• Also fits Porsche 718 Cayman GT4 RS (982) with PCCB stock brakes (front axle)

Features

• 2-piece floating rotor design - lightweight aluminum hat + cast-iron ring for optimal balance of strength, heat capacity and reduced unsprung/rotational mass
• Slotted, vented rotor surface for superior heat dissipation, pad-gas/gas-buildup purge, and fade resistance under heavy braking
• Curved-vane internal ventilation - acts like a centrifugal pump to draw cooling air through rotor for consistent thermal management under track or spirited driving
• Floating-mount system with high-strength alloy steel pins + anti-noise spring washers - allows thermal expansion/contraction while keeping rotor centered and eliminating rattles
• Direct bolt-on replacement - works with OEM calipers and uses original pad-shape (PCCB-to-iron pad shape swap required) - no modification needed
• Retains original brake bias and ABS calibration - swap without altering brake system geometry
• Replaceable disc-ring design - extend service life by replacing rings only, not entire rotor assembly
• Ideal for track use, spirited street driving, or heavy-duty braking without risk or overheating typical with carbon-ceramic rotors

Specifications

• Part Number: A1-154
• Rotor Type: 2-piece, floating, vented & slotted front rotor set
• Hat Material: 6061-T6 aluminum (CNC-machined)
• Rotor Ring Material: Proprietary cast iron, machined in-house
• Mount Hardware: Heavy-duty cadmium-plated alloy-steel drive pins + cap screws + anti-noise spring washers
• Installation: Direct OEM-bolt-on (requires iron-pad shape for PCCB conversion)
• Sold As: Pair (left + right front rotors with floating hardware)

Included Components

• 2x Front rotors (left and right) - 2-piece slotted/vented design
• Floating-mount hardware (drive pins, washers, screws) required for installation

Product Description

The GiroDisc A1-154 rotor kit transforms the front braking system of Porsche 991-series GT3, GT3 RS, GT2 RS or 718 GT4 RS equipped with PCCB (carbon-ceramic) brakes into a high-performance, track-ready iron rotor setup. Designed as a direct bolt-on replacement, these rotors bolt to the OEM hub and accommodate the smaller "iron pad" shape (from iron-brake GT3s) - offering a more track-friendly, robust, and serviceable braking system while retaining factory calipers and brake bias.

By combining a lightweight 6061-T6 aluminum hat with a machined cast-iron rotor ring, A1-154 reduces unsprung and rotational weight compared to ceramic or heavy stock rotors, improving suspension responsiveness, steering feel, and braking modulation. The curved-vane ventilation and slotted/vented rotor design deliver superior heat dissipation and pad-gas clearance - reducing fade and maintaining consistent stopping performance even under repeated hard braking or track conditions. The floating mount system allows for thermal expansion and self-centering, while anti-noise washers prevent unwanted rotor noise or rattles when cold. For enthusiasts seeking a durable, high-performance, cost-effective brake upgrade (especially for track or aggressive use), GiroDisc A1-154 offers an excellent balance of braking performance, reliability, and maintenance convenience.