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Description
Girodisc Rear Replacement Rotor Ring Set - F8x M2, M3, M4 W/ Blue 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 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
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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]
The publisher's description of this book claims that there would be a severe reaction within American society due to the facts Professor Stannard brought to light. There was, unfortunately yet not unexpectedly, not much of a response to the horrifying truths revealed in his compelling narrative on the fate of the Western Hemisphere's indigenous people. Most Americans simply do not seem to care whether their nation's history, from the moment Columbus set foot in "The New World" and claimed that the people he encountered would make good slaves to the immediate present, is bathed in copious amounts of indigenous people's blood. The European's behavior when they were unleashed upon the unsuspecting Native Americans reveals not only their homicidal nature and destructive approach to a relatively pristine world; but their unfathomably horrid and continuous attempts to keep the destruction and death going. Extermination was the name of the game and even a cursory glance at the American newspapers of the nineteenth century reveals a national psychology which leaves one in a vast and endless state of confusion and disbelief. But it's all true. The phrase, "The Final Solution" was coined by nineteenth century Americans, not Hitler's Germany. Tens of millions perished, an eternal food source, the buffalo herds, were almost rendered extinct and while all this was occurring the people of Africa were chained to their masters' bidding. The people of Iraq understand. So do the Vietnamese and now the Syrians and many, many, many more. Of course, on publication Dr. Stannard was labeled a crank for mostly revealing that American "exceptionalism" is merely a high falootin' excuse for mass death and destruction.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 27, 2017
C
Verified Purchase
C Rasmussen MD, MS
Phoenix, US
★★★★★ 5
Horrifying but it is a must read
Format: Paperback
This book should be required reading for all high-school students rather than the friendly history books that treat Columbus as a hero. This man was a murderous psychopath. Strong words but after reading this powerful text you will agree. I am ashamed at what these monsters from Spain, and England and elsewhere did soon after Columbus "discovered" the Americas. And all of the sacred knowledge lost. Everything the Mayans wrote down was burned. Knowledge from prehistory--all gone. All of the knowledge from prehistory the Indians in the Amazon basin held, all of the technology on agriculture, building, medicine, sacred knowledge, and much more gone. And for what?
I cannot tell you how powerful this book is. I cannot get it out of my head. If you think black lives matter well, sorry folks indigenous Indians of the New World MATTER MORE. They should be rioting for compensation from Spain and England. Oh, I forgot, nobody's left to riot.
It was a complete deliberate genocide killing perhaps 80 million paleo-indians from the 15th century on. And they are still killing the rest of them in Mesoamerica and esp. the Amazon where oil and mineral companies are murdering the remainder. And nobody seems to care! Read this book and learn the truth finally.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on September 19, 2020
L
Verified Purchase
Leric ashe
Bozeman, US
★★★★★ 5
In 600yrs. , life itself, is elusive
Format: Paperback
American Holocaust or books related to the Native American should be required reading. The carnage or genocide, on the inflicted erased thousands of years of culture. We have lost so much which makes us, all less. Hispaniola, had a population of 8,000,00, in 1496. By 1535 they were extinct. Equivalent to N.Y. city today. Spanish and British. One looking for gold, the latter imposing European values, to steal land. But what was most fascinating, the religious hypocrisy. To kill, enslave, torture in the name of God. Who snatches babies from their mother, and feeds them to dogs, hanging natives from a gibber, and burned alive, brand enslaved women's faces every time they are resold ? The British and Spanish were the "Very ministers of Hell".
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Reviewed in the United States on November 19, 2023
T
Verified Purchase
Tameka Hanford
San Leandro, US
★★★★★ 5
Academic / Thought-Provoking
Format: Paperback
They Were Her Property: White Women as Slave Owners in the American South is a powerful, eye-opening work that challenges long-held assumptions about slavery and gender in American history. Stephanie E. Jones-Rogers thoroughly dismantles the myth that white women were passive or marginal participants in the institution of slavery. Through meticulous research and extensive use of primary sources, including legal records, letters, and testimonies from formerly enslaved people—the book reveals that many white women were active, knowledgeable, and often brutal slave owners in their own right.
What makes this book especially compelling is how it centers the voices and experiences of enslaved people to expose the economic, legal, and physical power white women wielded. Jones-Rogers shows that white women not only benefited from slavery but also enforced it, defended it, and used it to build wealth and social status. The writing is clear, authoritative, and accessible, making complex historical arguments understandable without oversimplifying them.
This book is an essential read for anyone studying American history, slavery, race, or gender. It forces readers to confront uncomfortable truths and rethink narratives that have long softened or excused the role of white women in slavery. They Were Her Property is both academically rigorous and deeply impactful—a necessary contribution to honest historical understanding.
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Reviewed in the United States on December 16, 2025
E
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Eric Hobart
Omaha, US
★★★★★ 5
Remarkable analysis of slaveholding women in Antebellum America
Format: Paperback
Stephanie Jones-Rogers has provided us with a book that looks at the South's "peculiar institution" through a very different lens - the slaveholders/slaveowners, but this analysis looks at women that owned slaves, thus opening up a new avenue of study that I hadn't previously seen.
Jones-Rogers offers a well written account that is rich in historical details. She demonstrates through vivid historical evidence that the women that owned enslaved people were primarily driven by economic motives, and that these women were just as demanding and could be just as harsh as the "typical" slaveowner image that has been crafted over the years.
The book is organized thematically, and each chapter demonstrates the economic motivation behind slave ownership. The reader is offered views of everything from young children becoming slave owners when their parents "gifted" them an enslaved person, and how these young girls were taught that this was "property" that could be used as desired to how these female slaveholders would sell their slaves to meet their economic goals.
All told, this is a fascinating book that uncovers a long ignored slice of Antebellum American history that makes the historiographical literature of pre-Civil War history much richer.
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