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Girodisc 2 Piece Front Rotors Porsche 981 / 718 Boxster / Cayman

SKU: GIRA1-153
Price
$1,350.00
In Stock and Ready to Ship!

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Installation Services

Don’t worry about the hassle — let our expert team at Forza Motorworks handle the installation for you. Our professional installation ensures everything fits and operates exactly as intended, giving you clean, factory-quality results, proper wiring or mounting, and avoiding the risks of DIY mistakes. You’ll save time, avoid frustration, and get peace of mind knowing the job is done right the first time. Contact us to learn about our installation services and enjoy a seamless upgrade from day one.

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Forza Motor Works accepts returns for exchange, store credit, or refund within fourteen (14) calendar days of the delivery date, subject to the terms and conditions below. After fourteen (14) calendar days, all sales are final unless otherwise approved in writing by Forza Motor Works.

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Forza Motor Works
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FITMENT, INSTALLATION & PRODUCT USE

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Product Description

Upgrade the braking performance, thermal management, and durability of your Porsche with the GiroDisc 350mm Two-Piece Front Brake Rotor Kit. Engineered for select Porsche Carrera, 981, and 718 applications equipped with compatible 330mm factory front iron brakes, this premium braking upgrade increases rotor diameter to 350mm while retaining the original brake calipers.

Unlike conventional replacement rotors that maintain the original brake dimensions, the GiroDisc A1-153 system increases front rotor diameter from 330mm to 350mm. The larger friction ring provides additional braking leverage and increased cooling capacity, making it an attractive upgrade for Porsche owners seeking improved braking performance during spirited street driving and demanding track use.

To accommodate the larger rotors, GiroDisc includes the necessary caliper spacers and mounting bolts. These components reposition the original front calipers to provide clearance for the 350mm discs, allowing the upgraded rotor system to integrate with the existing braking hardware on approved applications.

The GiroDisc system features a two-piece floating rotor design that separates the cast-iron friction ring from the aluminum center hat. This construction allows controlled thermal expansion between the components, helping reduce heat-related stress and supporting consistent braking performance during repeated high-temperature braking events.

The friction rings are manufactured from GiroDisc's proprietary cast-iron formulation, poured in the United States and precision-machined in-house. This material is engineered to withstand the substantial thermal loads generated by aggressive braking while providing a durable friction surface for compatible street and performance brake pads.

To improve cooling efficiency, GiroDisc incorporates directional curved internal cooling vanes. Developed from motorsport applications, these vanes act as a centrifugal pump, drawing air through the rotor and directing it outward. The larger 350mm rotor diameter provides additional capacity for heat dissipation compared with the original 330mm configuration.

The center hats are manufactured from U.S.-sourced 6061-T6 aircraft-grade aluminum, combining lightweight construction with the strength required for high-performance braking. By separating the aluminum mounting hat from the iron friction ring, GiroDisc creates a serviceable rotor assembly designed for demanding use.

Each rotor incorporates 10 high-strength alloy-steel floating drive pins, manufactured by GiroDisc in the United States. These pins transfer braking forces between the rotor ring and center hat while allowing controlled axial and radial movement as temperatures change.

The drive pins feature corrosion-resistant cadmium plating and are secured using class 12.9 cap screws and hardened washers. GiroDisc also incorporates anti-noise spring washers to minimize the rattling commonly associated with traditional floating brake rotors.

This floating mounting system allows the friction ring to expand during heavy braking and helps the rotor self-center between the brake pads. The result is a premium braking assembly designed to accommodate repeated temperature changes without compromising the integrity of the rotor-to-hat connection.

Another major advantage is the system's replaceable friction-ring design. Once the initial GiroDisc rotor assemblies are installed, worn iron rings can be replaced while retaining the existing aluminum hats, provided the hats and mounting hardware remain within the manufacturer's service specifications.

For Porsche owners seeking more braking leverage, improved thermal management, and long-term rotor serviceability without purchasing a complete aftermarket big brake kit, the GiroDisc A1-153 provides a practical and performance-focused front brake upgrade.

Fitment Notes

  • Designed for select Porsche 911 Carrera front brake applications

  • Designed for select Porsche Boxster / Cayman (981) applications

  • Designed for select Porsche 718 Boxster / Cayman applications

  • Intended for vehicles equipped with the applicable 330mm factory front iron brake configuration

  • Increases front rotor diameter from 330mm to 350mm

  • Includes caliper spacers and mounting bolts to accommodate the larger rotor diameter

  • Retains the original front brake calipers on approved applications

  • Uses the appropriate factory-style front brake pad configuration

  • Designed for the front axle only

  • Includes both left and right front rotor assemblies

  • Two-piece floating brake rotor construction

  • Direct-fit upgrade with the supplied caliper spacing components on approved applications

  • Not compatible with factory Porsche Ceramic Composite Brakes (PCCB)

  • Not intended as a direct replacement for vehicles already equipped with larger front brake rotors

  • Not a universal fitment for every Porsche Carrera, 981, or 718 brake package

  • Porsche model, year, trim, rotor dimensions, and caliper configuration must be verified before ordering

  • Porsche GT3, GT4, GT4 RS, and other GT applications require separate fitment verification

  • Not intended for Porsche 911 Turbo / Turbo S without manufacturer confirmation

  • Verify wheel-to-caliper clearance after installation

  • Front and rear brake rotors are sold separately

  • Professional installation recommended

  • Follow GiroDisc's installation and brake bedding procedures

  • Inspect brake pads, calipers, brake hoses, and mounting hardware before installation

Included

  • One (1) GiroDisc left-front 350mm two-piece brake rotor assembly

  • One (1) GiroDisc right-front 350mm two-piece brake rotor assembly

  • Two (2) proprietary cast-iron friction rings

  • Two (2) CNC-machined 6061-T6 aluminum center hats

  • Preassembled floating drive-pin hardware

  • Anti-noise spring washers

  • Front caliper spacers for the intended application

  • Caliper mounting bolts supplied by GiroDisc

Sold Separately:

  • Front brake pads

  • Rear GiroDisc brake rotors

  • Replacement front friction rings

  • High-temperature brake fluid

  • Additional brake service components, if required

  • Professional installation labor

Product Specs

  • Manufacturer: GiroDisc

  • Manufacturer Part Number: A1-153

  • Product Type: Oversized Two-Piece Floating Front Brake Rotor Kit

  • Vehicle Applications: Select Porsche Carrera / 981 / 718

  • Brake Position: Front

  • Factory Rotor Diameter: 330mm

  • Upgraded Rotor Diameter: 350mm

  • Rotor Diameter Increase: 20mm

  • Rotor Radius Increase: 10mm

  • Rotor Construction: Two-Piece Floating

  • Friction Ring Material: Proprietary Cast Iron

  • Friction Ring Casting: United States

  • Friction Ring Machining: GiroDisc In-House

  • Center Hat Material: 6061-T6 Aluminum

  • Center Hat Material Origin: United States

  • Internal Cooling: Directional Curved Vanes

  • Floating Hardware: 10 Drive Pins Per Rotor

  • Drive Pin Material: High-Strength Alloy Steel

  • Drive Pin Finish: Cadmium Plated

  • Fasteners: Class 12.9 Cap Screws

  • Fastener Washers: Hardened

  • Anti-Noise Hardware: Spring Washers

  • Axial Rotor Float: Yes

  • Radial Rotor Float: Yes

  • Self-Centering Rotor Design: Yes

  • Caliper Spacers: Included

  • Caliper Mounting Bolts: Included

  • Original Calipers Retained: Yes, on Approved Applications

  • Replacement Friction Rings: Serviceable

  • Aluminum Hats Reusable: Yes, Subject to Inspection

  • Factory PCCB Compatibility: No

  • Installation: Bolt-On With Supplied Caliper Spacers

  • Sold As: Complete Front Axle Pair

Product Features

  • Oversized 350mm rotor upgrade increases the original 330mm front rotor diameter by 20mm, providing additional braking leverage and cooling capacity.

  • Included caliper spacers and mounting bolts allow the larger front rotors to integrate with compatible factory Porsche brake calipers without requiring a complete aftermarket big brake kit.

  • Two-piece floating rotor construction allows controlled thermal expansion between the iron friction rings and aluminum center hats, helping manage heat-related stress during aggressive braking.

  • Proprietary U.S.-cast iron friction rings with directional cooling vanes combine durable braking surfaces with efficient airflow to support consistent braking performance.

  • Lightweight 6061-T6 aluminum hats and precision floating hardware use 10 high-strength drive pins per rotor, corrosion-resistant plating, and anti-noise spring washers for reliable operation.

  • Replaceable friction-ring design allows worn iron rotor rings to be serviced independently of the aluminum hats, helping reduce long-term replacement costs for performance and track-driven vehicles.