Girodisc Rear Replacement Rotor Ring Set - F8x M2, M3, M4 W/ Silver/Red/Gold CalipersGirodisc is a Braking Technology Company dedicated to developing the best quality high performance braking components and solutions. The company has been in business since 2003 and is guided under the direction of company Principal Martin Meade, who spent five years as an Engineer with Porsche Engineering Services, where he played a role in developing current Porsche technology. PRODUCT INFORMATION Need new rings for your Girodisc 2 Piece Floating
Girodisc is a Braking Technology Company dedicated to developing the best quality high performance braking components and solutions. The company has been in business since 2003 and is guided under the direction of company Principal Martin Meade, who spent five years as an Engineer with Porsche Engineering Services, where he played a role in developing current Porsche technology.
PRODUCT INFORMATION
Need new rings for your Girodisc 2-Piece Floating Rotor Set? We got them. Rings come complete with all new hardware and full instructions for re-assembly; but if you choose you can send us the hats and we will do all the re-assembly and turning of the rotors for only the cost of shipping.
This service is available for the life of your rotors. Price is for a pair of rings and 2 hardware kits. Additional hardware kits are available separately upon request.
The Girodisc iron rotors replace the factory carbon ceramic rotors with no modifications necessary. We strongly recommend changing pad material to one suitable for iron rotors.
The primary purpose of the Girodisc system is to reduce unsprung and overall vehicle weight. The secondary purpose is to increase the ventilation and cooling capacity of the brake disc while retaining it's original dimensions. This is accomplished by using two-piece disc construction. The central “hat” section of the disc is made from 6061-T6 aircraft specification aluminum.
The disc is made from cast iron, to the same specification and material as used by professional racing organizations. It is a curved vane design, developed in racing to act as a centrifugal pump to force cooling air through the disc. The rotor and hat have a floating mount system, which utilizes high strength alloy steel drive pins, manufactured by Girodisc to our own specifications and cadmium plated for a long lasting corrosion resistance. These pins take the load from braking actions while maintaining the axial and radial float between the hat and disc. The pins are secured by grade 12 cap screws with hardened washers. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise spring clips on the rotor side which allow the rotor to grow with heat expansion but eliminate the rattle and noise associated with floating rotors. This float also allows the rotor to self center between the pads.
Important Questions Answered
What is required to install the Girodisc system?
The Girodisc system is a direct replacement for the OE disc. No modifications are necessary. The disc will bolt directly to the car and work with OE calipers and pads perfectly. Once the Girodisc system is in place, simply replace the cast iron rotor when needed. Some discs are larger in diameter and come with caliper spacers. If longer bolts are required, they are also supplied.
How does reducing weight of the braking system benefit the vehicle?
The Girodisc will generally weigh between 4 – 8 lbs less than the oe disc it will replace. This is due to the heavy cast iron hat section being replaced with lightweight, high strength aluminum. The mass of any vehicle requires energy to accelerate or decelerate. Reducing the vehicle mass improves acceleration, and requires less energy to be dissipated during deceleration. Rotating mass requires additional energy in order to increase or decrease its speed of rotation. Decreasing the mass of the disc has a great benefit due to reduction in rotational inertia. This will allow more of the braking force to be available to decelerate the vehicle, not the disc.
Additionally, the mass of the brake system is also unsprung mass. Reducing the unsprung mass has the additional benefit of improved suspension performance, resulting in enhanced ride and handling. Rotating masses require additional energy to vary the plane on which they turn. The lighter the disc, the quicker the response of the vehicle steering due to the reduction in gyroscopic effect/rotational inertia of the disc. As an example, compare the weight of the Ferrari 360 OE disc at 18.2 lbs, and the Girodisc at 14 lbs. The Girodisc is 4.2 lbs lighter per disc. Replacing all four discs will save 16.8 lbs of rotating, unsprung mass.
Why slotted discs?
The edges of the slots continuously clean and refresh the pad surface. This will allow the pads to have a maximized friction surface always available. Additionally, they prevent containments from collecting between the pad and disc interface. The disc is lightened, decreasing its rotational inertia. Slots prevent the formation of a water film on the disc in wet weather, maintaining the best brake response.
A note on drilled discs
Girodisc doesnotrecommend drilled discsfor high performance applications. The rapid heating and cooling cycles will cause cracking on the friction surface of a drilled disc. The use of high friction or racing pads will exaggerate this condition. Most pad manufacturers specifically recommend that their race pads not be used on a drilled disc for this reason. Girodisc can drill discs for an additional fee, if the customer is aware of the potential hazards of drilling the discs.
Note as example the cracking in this OE Ferrari 550 drilled disc after one track day. Also note this custom front disc of a Porsche 993 Turbo after hard use (see photos).
Please see photos attached
Should new discs and pads be bedded in and if so, how?
The answer is yes, for optimum performance, any time different friction materials or discs are introduced, a bedding procedure should be carried out.
Which direction should the discs rotate?
For maximum airflow and superior cooling, the Girodisc system uses curved vanes. For a curved vane internally vented disc, the geometry of the vanes dictates the direction of rotation. A curved vane disc must be installed with the vanes running back from the inside to outside diameters in the direction of rotation. Your discs will come with labels indicating their correct placement on the vehicle. Orienting the disc in this manner creates a centrifugal pump. The rotation of the disc causes air to be pumped from the center of the disc, through the vanes, and out through the outside diameter of the disc. This greatly enhances the disc’s ability to dissipate heat. Discs installed backwards have very limited cooling.
Models
2 Series / F87 M2 (2016-2021) / M2 Competition
2 Series / F87 M2 (2016-2021) / M2
2 Series / F87 M2 (2016-2021) / M2 CS
3 Series / F80 M3 (2014-2019) / M3
3 Series / F80 M3 (2014-2019) / M3 Competition
3 Series / F80 M3 (2014-2019) / M3 CS
4 Series / F82 / F83 (2014-2019) / M4
4 Series / F82 / F83 (2014-2019) / M4 Competition
4 Series / F82 / F83 (2014-2019) / M4 CS
4 Series / F82 / F83 (2014-2019) / M4 GTS
Shipping Notes
Free Standard Shipping on $100+ Orders to the USA.
Except Preorder products are shipped in 48 hours.
Delivery to the USA:
Standard Shipping : 3-10 business days
If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
To process your return/exchange, please contact us at [email protected]
I LOVE DAD WITH THE VERY HUNGRY CATERPILLAR is a sweet book of love, written from the perspective of a child to their father. The book uses imagery from other Eric Carle books alongside simple language to describe the connection between father and child, such as "Dad... You are easy to talk to... and you're fun to play with." Ellipses break up sentences across multiple pages, with animals that suit each phrase pictured as parent and child.
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Final verdict: Overall, this is a sweet picture book that would make a great gift for new fathers or fathers with young children.
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Reviewed in the United States on February 7, 2022
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Rains Family Farm
Charlottesville, US
★★★★★ 5
Daily devotional with ease.
Format: Imitation Leather
This is a great little devotional book for men. I bought two, one for me and one for my son. I keep mine at my desk at work and read it each morning and I enjoy the insightful quotes and verses that help me start my day. It truly only takes about a minute or two to read through everything and the verses are actually written out on the page with the reference. I know there are a lot of devotionals out there that you can select from, but I like this one because it’s small and compact and acutely directed towards men. The small size is perfect, the price is excellent, and the daily devotionals are spot on.
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Reviewed in the United States on March 3, 2026
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Matthew
Charlottesville, US
★★★★★ 5
Easy and fun to read! Cute and small, easy to travel with
Format: Imitation Leather
I’m obsessed with this book. Each devotion really does only take a minute to read. It’s compact so I leave it in my truck but sometimes I’ll bring it in and keep it by my bed. There’s a book mark ribbon that keeps your place if you get off track of your days and you can’t remember where you left off. And I also like HOW the messages are explained. I grew up in church and I’m always like “hmm that makes sense now that it’s put that way!” lol
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Reviewed in the United States on February 1, 2026
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Niles M
Dallas, US
★★★★★ 5
The Answer
Format: Imitation Leather
I purchased this book of Devotions as I was looking for a guide that would be simple to follow and compact. It seemed like I always was making excuses for not being as diligent with my faith. It was easy to tell my self that I could not keep up with God or travel with a guide as it was too inconvenient or bulky. From a content and simplicity to stay focussed, this was the source I needed. From a convenience standpoint, it could not be any better. I had tried apps and digital versions previously and it just wasn't the same. Holding a book and leafing through the pages just feels so much better to me. A definite must for those of you looking for a impactful, yet small and convenient way to continue the journey.
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Reviewed in the United States on May 21, 2026
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Rick
Phoenix, US
★★★★★ 5
One minute with god
Format: Imitation Leather
Perfect way to start my morning. Spiritual and uplifting.
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