How much lighter are the GiroDisc Porsche 991 front rotors than OEM?

The GiroDisc Porsche 991 front rotors weigh approximately 21.0 lbs each versus the OEM 24.4 lbs, reducing rotational and unsprung weight for quicker acceleration and improved suspension response, all while upgrading to a larger 350mm rotor.

What size are the GiroDisc Porsche 991 front rotors?

The GiroDisc Porsche 991 front rotors are 350mm in diameter, up from the OEM 340mm, delivering improved braking force and cooling capacity. Included caliper spacers position the larger rotor correctly against the factory calipers.

Are the GiroDisc Porsche 991 front rotors a direct OEM replacement?

Yes. The GiroDisc Porsche 991 front rotors are a direct replacement for the OEM disc with no modifications necessary, using the factory calipers with the included spacers on the 991.1 Carrera S, 4S, and GTS.

What are the GiroDisc Porsche 991 front rotors made of?

The GiroDisc Porsche 991 front rotors use a proprietary cast iron disc, poured domestically 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 991 front rotors make noise on the street?

No. The GiroDisc Porsche 991 front rotors use a floating mount with class 12.9 cap screws and anti-noise spring washers on the rotor side, which accommodate heat expansion while preventing the rattling associated with floating rotors and let the rotor self-center between the pads for silent street operation.

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Description

GiroDisc 350mm Slotted Front Brake Rotors with Spacers for 991.1 Porsche 911 Carrera 4S / GTS / S

Porsche 991 front rotors from GiroDisc are 2-piece, fully floating 350mm slotted front brake rotors with caliper spacers, a direct replacement for the OEM front discs on the 991.1 Porsche 911 Carrera S, 4S, and GTS. These GiroDisc Porsche 991 front rotors upgrade to a 350mm diameter over the OEM 340mm for improved braking force and cooling, while weighing approximately 21.0lbs versus the stock 24.4lbs to cut rotational and unsprung weight for quicker acceleration and better suspension response. The disc is crafted from GiroDisc’s proprietary cast iron, poured domestically and machined in-house, paired with a 6061-T6 aircraft-grade aluminum hat, and the curved vane design channels cooling air through the disc like a centrifugal pump. Sold and priced per pair.

Why the GiroDisc Porsche 991 Front Rotors?

The GiroDisc Porsche 991 front rotors serve as a direct replacement for the OEM disc, enhanced by the included caliper spacers, and step up to 350mm from the OEM 340mm for improved braking force and cooling capacity. At approximately 21.0lbs each versus the OEM 24.4lbs, they reduce rotational and unsprung weight for quicker acceleration and improved suspension response. The central hat is constructed from U.S.-sourced 6061-T6 aircraft-grade aluminum, while the disc is made from GiroDisc’s proprietary cast iron, poured domestically and precision-machined entirely in-house, with a race-inspired curved vane design that acts as a centrifugal pump to channel cooling air through the disc.

Floating Mount and Anti-Noise Design

The rotor and hat of the GiroDisc Porsche 991 front rotors are connected by a floating mount system with 10 high-strength alloy steel drive pins, manufactured in-house to proprietary specifications and cadmium-plated for long-lasting corrosion resistance. The pins handle the braking load while preserving axial and radial float between the hat and disc, secured by class 12.9 cap screws and hardened washers. To minimize noise during cold operation, the pins incorporate anti-noise spring washers on the rotor side that accommodate heat expansion while preventing the rattling typically associated with floating rotors, and the floating design lets the rotor self-center between the brake pads.

Features

2-piece, fully floating front rotor assembly with caliper spacers
350mm diameter, up from the OEM 340mm
Direct replacement for the OEM disc, no modifications necessary
Approximately 21.0lbs versus 24.4lbs OEM
Slotted rotors for maximum friction surface
Proprietary cast iron disc, poured domestically 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

Applications

Porsche 911 Carrera S: 991.1 | 2011-2016
Porsche 911 Carrera 4S: 991.1 | 2012-2016
Porsche 911 Carrera GTS: 991.1 | 2014-2016

Notes

Sold and priced per pair (one set of front rotors)
Includes caliper spacers required to fit the 350mm rotor to the factory calipers
Images may not depict the actual product

Frequently Asked Questions

How much lighter are the GiroDisc Porsche 991 front rotors than OEM? The GiroDisc Porsche 991 front rotors weigh approximately 21.0 lbs each versus the OEM 24.4lbs, reducing rotational and unsprung weight for quicker acceleration and improved suspension response, all while upgrading to a larger 350mm rotor.
What size are the GiroDisc Porsche 991 front rotors? The GiroDisc Porsche 991 front rotors are 350mm in diameter, up from the OEM 340mm, delivering improved braking force and cooling capacity. Included caliper spacers position the larger rotor correctly against the factory calipers.
Are the GiroDisc Porsche 991 front rotors a direct OEM replacement? Yes. The GiroDisc Porsche 991 front rotors are a direct replacement for the OEM disc with no modifications necessary, using the factory calipers with the included spacers on the 991.1 Carrera S, 4S, and GTS.
What are the GiroDisc Porsche 991 front rotors made of? The GiroDisc Porsche 991 front rotors use a proprietary cast iron disc, poured domestically 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 991 front rotors make noise on the street? No. The GiroDisc Porsche 991 front rotors use a floating mount with class 12.9 cap screws and anti-noise spring washers on the rotor side, which accommodate heat expansion while preventing the rattling associated with floating rotors and let 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 350mm Slotted Front Brake Rotors with Spacers for 991.1 Porsche 911 Carrera 4S / GTS / S [A1-122]

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GiroDisc 350mm Slotted Front Brake Rotors with Spacers for 991.1 Porsche 911 Carrera 4S / GTS / S

Why the GiroDisc Porsche 991 Front Rotors?

Floating Mount and Anti-Noise Design

Features

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews