How much lighter are the GiroDisc Porsche 718 rear rotors than OEM?

The GiroDisc Porsche 718 rear rotors are between 4 and 8 lbs lighter than the OEM disc, reducing unsprung weight and rotating mass at the rear axle for improved handling and braking response, while still bolting on as a direct replacement.

Are the GiroDisc Porsche 718 rear rotors a direct OEM replacement?

Yes. The GiroDisc Porsche 718 rear rotors are a direct replacement for the OEM rear disc with no modifications necessary, including the required spacers, and they use the factory calipers on the 718 GTS 4.0 and 981 Boxster Spyder.

Which brake pads should I run with the GiroDisc Porsche 718 rear rotors?

GiroDisc recommends using the 991 Carrera S / 4S / GTS rear pad shape with the GiroDisc Porsche 718 rear rotors for full sweep across the rotor face. This ensures the pad covers the full friction surface for even wear and consistent braking.

What are the GiroDisc Porsche 718 rear rotors made of?

The GiroDisc Porsche 718 rear rotors use a proprietary cast iron disc, poured in the USA and machined in-house, with a 6061-T6 aircraft-grade aluminum hat and 10 cadmium-plated alloy steel drive pins. Curved vanes pump cooling air through the disc for race-developed cooling.

Do the GiroDisc Porsche 718 rear rotors make noise on the street?

No. The GiroDisc Porsche 718 rear rotors use a floating mount with class 12.9 cap screws and anti-noise spring washers on the rotor side, which mitigate cold-operation noise while accommodating thermal expansion and letting the rotor self-center between the pads for silent street operation.

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Description

GiroDisc Slotted Rear Brake Rotors with Spacers for 981 / 982 Porsche Boxster Spyder, 718 Boxster and Cayman GTS 4.0

Porsche 718 rear rotors from GiroDisc are 2-piece, fully floating slotted rear brake rotors with spacers, a direct replacement for the OEM rear discs on the 982 718 Boxster and Cayman GTS 4.0 and the 981 Boxster Spyder. These GiroDisc Porsche 718 rear rotors pair a proprietary cast iron disc, poured in the USA and machined in-house, with a 6061-T6 aircraft-grade aluminum hat, and run 4 to 8lbs lighter than OEM to cut unsprung weight and rotating mass. The curved vane configuration acts as a centrifugal pump that channels cooling air through the disc, a design developed for racing, and the slotted friction surface improves performance under hard use. Sold and priced per pair.

Why the GiroDisc Porsche 718 Rear Rotors?

GiroDisc manufactures the central hat section of the Porsche 718 rear rotors from U.S.-sourced 6061-T6 aircraft-grade aluminum, while the disc is crafted from GiroDisc’s proprietary cast iron, poured in the USA and fully machined in-house. The curved vane configuration acts as a centrifugal pump, channeling cooling air through the disc, a design originally developed for racing applications. At 4 to 8 lbs lighter than the OEM disc, the rotor reduces unsprung weight for improved handling while delivering track-ready braking, and the slotted surface maximizes the friction area.

Floating Mount and Anti-Noise Design

The rotor and hat of the GiroDisc Porsche 718 rear rotors are connected by a floating mount system using 10 high-strength alloy steel drive pins, produced by GiroDisc in the USA to precise specifications and cadmium-plated for corrosion resistance. The pins bear the braking load while preserving axial and radial float between the hat and disc. Secured by class 12.9 cap screws and hardened washers, the pins use anti-noise spring washers on the rotor side to mitigate noise during cold operation while accommodating thermal expansion and letting the rotor self-center between the brake pads.

Features

2-piece, fully floating rear rotor assembly with spacers
Direct replacement for the OEM disc, no modifications necessary
Between 4 and 8 lbs lighter than OEM
Slotted rotors for maximum friction surface
Proprietary cast iron disc, poured in the USA and machined in-house
6061-T6 aircraft-grade aluminum hat
10 cadmium-plated high-strength alloy steel drive pins
Curved cooling vanes that pump air through the disc
Class 12.9 cap screws with anti-noise spring washers for silent street operation
Improved overall braking performance

Applications

Porsche 718 Boxster GTS 4.0: 982 | 2020-present
Porsche 718 Cayman GTS 4.0: 982 | 2020-present
Porsche Boxster Spyder: 981 | 2015-2016

Notes

Sold and priced per pair (one set of rear rotors)
GiroDisc recommends using the 991 Carrera S / 4S / GTS rear pad shape for full sweep across the rotor
Images may not depict the actual product

Frequently Asked Questions

How much lighter are the GiroDisc Porsche 718 rear rotors than OEM? The GiroDisc Porsche 718 rear rotors are between 4 and 8lbs lighter than the OEM disc, reducing unsprung weight and rotating mass at the rear axle for improved handling and braking response, while still bolting on as a direct replacement.
Are the GiroDisc Porsche 718 rear rotors a direct OEM replacement? Yes. The GiroDisc Porsche 718 rear rotors are a direct replacement for the OEM rear disc with no modifications necessary, including the required spacers, and they use the factory calipers on the 718 GTS 4.0 and 981 Boxster Spyder.
Which brake pads should I run with the GiroDisc Porsche 718 rear rotors? GiroDisc recommends using the 991 Carrera S / 4S / GTS rear pad shape with the GiroDisc Porsche 718 rear rotors for full sweep across the rotor face. This ensures the pad covers the full friction surface for even wear and consistent braking.
What are the GiroDisc Porsche 718 rear rotors made of? The GiroDisc Porsche 718 rear rotors use a proprietary cast iron disc, poured in the USA and machined in-house, with a 6061-T6 aircraft-grade aluminum hat and 10 cadmium-plated alloy steel drive pins. Curved vanes pump cooling air through the disc for race-developed cooling.
Do the GiroDisc Porsche 718 rear rotors make noise on the street? No. The GiroDisc Porsche 718 rear rotors use a floating mount with class 12.9 cap screws and anti-noise spring washers on the rotor side, which mitigate cold-operation noise while accommodating thermal expansion and letting the rotor self-center between the pads for silent street operation.

About GiroDisc

Founded in 2003, GiroDisc set out to revolutionize performance braking by designing and manufacturing two-piece brake rotors engineered to perform flawlessly under extreme conditions. Traditional one-piece rotors are heavy, retain heat, and increase unsprung weight, which hurts handling; GiroDisc’s fully floating design uses tension hardware for silent street operation while delivering track-ready performance. By focusing exclusively on this specialized niche, GiroDisc has advanced its engineering and manufacturing to industry-leading standards, letting enthusiasts upgrade their existing brake systems without the expense and complexity of a big brake kit. Based in Bellingham, Washington, GiroDisc handles every aspect of production on site, from design and engineering to manufacturing and fulfillment.

Additional Information

The Bulletproof Automotive website contains many thousands of products purchased in multiple different currencies. All of the prices are entered manually and accurately at the time of entry. Due to the consistently fluctuating international exchange rates, at times prices may not be able to be honored at their original intended rate. We apologize for any inconvenience this may cause, unfortunately our website is unable to compensate dynamically for what can at times be volatile changes in the cost of items due to currency values fluctuating, changes in prices from suppliers, changes in shipping and import duties, and other factors. Rest assured that any order you place on line will be at zero risk to you in this area. If in the event your order cannot be fulfilled at the original intended website price we will offer you a 100% refund, no questions asked. We will continue to do our best to maintain updated prices and we will always continue to offer our price match guarantees as well to ensure our prices are always the best for you. In short, prices may change without notice. It is always advised to give us a call prior to placing your order online to confirm availability and to confirm current pricing.

Shipping Policy

Items that are in stock in the US, either at Bulletproof’s warehouse or at a supplier’s warehouse, are generally delivered within 7-10 days. Special order items from overseas take considerably longer. As a courtesy Bulletproof offers delivery estimates to our customers which take into consideration manufacturer availability and shipping schedule. These estimates represent our best guess based on previous orders from the manufacturer and do not in any way imply a guaranteed delivery window. Many manufacturers work in a “just in time” inventory system and often take 2-20+ weeks to produce an item once an order is submitted. All deliverable items are then sent to our Japanese warehouse. Bulletproof ships a minimum of one full ocean freight container every month from Japan, oftentimes more than one a month. Ocean freight takes an average of 4 weeks. Typically it breaks down to one week in Japan for paperwork and customs, two weeks by boat and one week in US customs/clearance. Due to the wide number of variables between manufacturer and shipping schedules, delivery estimates are simply just that – estimates. We attempt to estimate conservatively and we usually deliver faster than our estimates suggest. It is not Bulletproof’s policy to guarantee delivery time of any special order item, this is impossible for us to do. By ordering you acknowledge that there is no required delivery ETA and an order may not be canceled or altered due to manufacturing or shipping delays, all ETA’s are provided as a best guess only. Please review the full Terms & Conditions here.

BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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GiroDisc Slotted Rear Brake Rotors with Spacers for 981 / 982 Porsche Boxster Spyder, 718 Boxster and Cayman GTS 4.0 [A2-049B]

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GiroDisc Slotted Rear Brake Rotors with Spacers for 981 / 982 Porsche Boxster Spyder, 718 Boxster and Cayman GTS 4.0

Why the GiroDisc Porsche 718 Rear Rotors?

Floating Mount and Anti-Noise Design

Features

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews