Do the GiroDisc Rear Rotors for 991 also fit the 992 and 996?

Yes. GiroDisc lists the GiroDisc Rear Rotors for 991, 992 and 996 generation Porsche 911 cars under one part number. The kit includes caliper spacers and longer bolts for the 350mm ring. Owners of a 991 base Carrera should speak to Bulletproof Automotive first, since GiroDisc gives a separate note for that model.

What is the purpose of the caliper spacers in this kit?

They move the rear caliper outward so it sits correctly over the larger 350mm GiroDisc ring. The longer bolts supplied with them replace the factory caliper bolts to account for the spacer thickness. With both fitted, the original caliper keeps working without any further changes.

Which parts of this rear rotor are made by GiroDisc?

The cast iron ring, the drive pins and the final machining all come from GiroDisc. The ring is poured in the USA from its proprietary iron and machined start to finish in Bellingham, Washington, and the cadmium-plated drive pins are made to its own specification. The hat is US-sourced 6061-T6 aluminum.

When should the iron rings be replaced on these rotors?

Replace the rings when they reach the minimum thickness marked on the hat and on the edge of the ring, or straight away if a crack runs through to the outer edge. The hats are reused, so only the rings and their mounting hardware change at that point.

Is there a torque limit for the floating hardware?

Yes. The drive pin cap screws are never tightened beyond 60 in-lb, or 7 Nm. They are meant to allow the ring to float on the hat, so some apparent looseness is normal and should not be corrected with extra torque.

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Description

GiroDisc Rear Rotors for 991, 992 and 996 Porsche 911 with Caliper Spacers

GiroDisc’s Rear Rotors for 991, 992 and 996 Porsche 911 models give the rear axle a 350mm two-piece floating disc, and GiroDisc includes the caliper spacers and longer bolts the larger diameter needs. That covers three generations of the water-cooled 911 with one part number. The ring is poured in the USA from GiroDisc’s own iron and machined in-house, and it rides on a 6061-T6 aluminum hat that stays on the car when the rings are eventually replaced.

Fitment and Installation

On the Rear Rotors for 991, 992 and 996, each caliper moves out on its GiroDisc spacer to clear the bigger ring, held by the longer bolts supplied in the kit, and the rotor then mounts to the hub like the original. GiroDisc publishes a specific setup note for 991 base Carrera cars, so those owners should check with us first. The floating ring rides on ten cadmium-plated drive pins with class 12.9 cap screws.

Features

350mm rear ring with caliper spacers and longer bolts included
One part number covering 991, 992 and 996 generation cars, per GiroDisc
Ten alloy steel drive pins made by GiroDisc in the USA
Spring washers on the rotor side that silence cold rattle
Curved-vane cooling that moves air from hub to rim
US-sourced 6061-T6 aluminum hats

What’s Included

Rear rotor assemblies (L/R)
Caliper spacers
Longer caliper bolts

Applications

Porsche 911: 991, 992, 996

Notes

991 base Carrera owners should contact Bulletproof Automotive before ordering, as GiroDisc gives a separate setup note for those cars
For 996 and 997 cars, GiroDisc also lists the GiroDisc 996 and 997 rear rotors
The GiroDisc 996 and 997 front rotors step the front axle up to 350mm on 996 cars
Contact Bulletproof Automotive for the correct replacement rings when these reach minimum thickness
Stock photography may not depict the actual product

Frequently Asked Questions

Do the GiroDisc Rear Rotors for 991 also fit the 992 and 996? Yes. GiroDisc lists the GiroDisc Rear Rotors for 991, 992 and 996 generation Porsche 911 cars under one part number. The kit includes caliper spacers and longer bolts for the 350mm ring. Owners of a 991 base Carrera should speak to Bulletproof Automotive first, since GiroDisc gives a separate note for that model.
What is the purpose of the caliper spacers in this kit? They move the rear caliper outward so it sits correctly over the larger 350mm GiroDisc ring. The longer bolts supplied with them replace the factory caliper bolts to account for the spacer thickness. With both fitted, the original caliper keeps working without any further changes.
Which parts of this rear rotor are made by GiroDisc? The cast iron ring, the drive pins and the final machining all come from GiroDisc. The ring is poured in the USA from its proprietary iron and machined start to finish in Bellingham, Washington, and the cadmium-plated drive pins are made to its own specification. The hat is US-sourced 6061-T6 aluminum.
When should the iron rings be replaced on these rotors? Replace the rings when they reach the minimum thickness marked on the hat and on the edge of the ring, or straight away if a crack runs through to the outer edge. The hats are reused, so only the rings and their mounting hardware change at that point.
Is there a torque limit for the floating hardware? Yes. The drive pin cap screws are never tightened beyond 60 in-lb, or 7 Nm. They are meant to allow the ring to float on the hat, so some apparent looseness is normal and should not be corrected with extra torque.

About GiroDisc

GiroDisc designs, manufactures, and sells 2-piece, fully floating brake rotors for a wide range of performance vehicles. Every major component, including the hats, rotor rings, and drive pins, is manufactured in-house at their facility in Bellingham, Washington, from domestically sourced materials. GiroDisc rotors use a proprietary high-carbon iron ring formulated for superior metallurgy and thermal performance, paired with reusable machined-aluminum hats that reduce the long-term cost of maintaining a high-performance brake system. The 2-piece floating design sheds unsprung and rotating mass while remaining street-friendly, delivering race-proven braking for track and street use alike.

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 Rear Rotors for 991, 992 and 996 Porsche 911 with Caliper Spacers [A2-032B]

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GiroDisc Rear Rotors for 991, 992 and 996 Porsche 911 with Caliper Spacers

Fitment and Installation

Features

What’s Included

Applications

Notes

Frequently Asked Questions

About GiroDisc

Reviews