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Description
Girodisc Rear 2-Piece Floating Rotor 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 The Girodisc system is a direct replacement for the
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
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 perfectly. By upgrading your brakes with lightweight high performance replacements as opposed to a big brake kit, your factory bias is maintained as well as your ABS efficiency.
The central hat section of the Girodisc rotor is made from strictly U.S. sourced 6061-T6 aircraft specification aluminum. The disc is made from Girodisc's own proprietary cast iron, poured in the USA and machined from start to finish in house at Girodisc. The rotor utilizes 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 10 high strength alloy steel drive pins, manufactured by Girodisc in the USA to their 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 class 12.9 cap screws with hardened washers. In order to keep the rotors from making noise when cold, the pins are mounted with anti-noise spring washers 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.
Once the Girodisc system is in place, simply replace the cast iron rotor when needed.
Sold/priced per pair.
Fitment Information
This application is only for F87 M2 & M2 Competition Coupe, F80 M3 Sedan, F82 M4 Coupe and F83 M4 Convertible models, including Competition, CS and GTS, equipped with optionalS2NK M Carbon Ceramic brake package (gold calipers)orS2NH M-Sport brake package (red or silver calipers).
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]
If you want to buy your last hose then flexzilla is your hose.
Style: Standard Grip, Size: 50ft, Color: Chartreuse
O.K. if you are reading my review I can honestly say that I don't think anyone knows what they are buying with this hose like I do as Amazon has the record of when I bought 100 feet of this hose. Long Long Long term user=purchased in 2017. I used this hose today and it looks-feels-works like it did the day I hooked it up on my reel. So flexible you can use it for a tourniquet if required. Hot-cold it don't matter this hose is the best. I am 70 yrs. old and it is the best hose I ever used in my life. Buy this hose once and then be done. Never kinks and not to heavy when moving around. Buy some and get on with whatever work you need to wash and then roll it up and forget about it.
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Reviewed in the United States on May 22, 2026
T
Verified Purchase
Twylla J. Cameron
Alexandria, US
★★★★★ 4
Hose kinks.
Style: Standard Grip, Size: 100ft, Color: Chartreuse
I bought this hose 2 months ago and really like how light it is and easy to pull around the yard. However, I am having a problem with it kinking all of the time. It is really frustrating to have to go back and straighten it out when I am watering.
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Reviewed in the United States on April 19, 2026
A
Verified Purchase
A. Edwards
Fort Morgan, US
★★★★★ 5
Excellent product.
Style: Standard Grip, Size: 50ft, Color: Chartreuse
I've dealt with many different brands of hoses, took into account quality and price. After many disappointing purchases I can finally say "I got the right one this time". It is exactly as advertised, lightweight, flexible and very easy to handle. You won't go wrong with Flexzilla garden hose!!!
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Reviewed in the United States on May 24, 2026
L
Verified Purchase
levi clark
Natrona Heights, US
★★★★★ 5
There is no substitute to Flexzilla Hose
Style: Standard Grip, Size: 100ft, Color: Chartreuse, Style: Standard Grip, Size: 100ft, Color: Chartreuse
I absolutely love this hose! I purchased roughly 300 feet last year for use in my garden. It's extremely light and durable when you are dragging it around. For the most part it is kink free. If there does happen to be a kink down the line, a quick tug fixes the problem. No leaks, no shrinkage. Easy to install on any hydrant. DEFINITELY compact compared to other heavy hoses. The best part, it's super easy to coil it back up and hang in the tool shed. So I ordered a couple more 100 footers. I will definitely buy more.
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Reviewed in the United States on April 17, 2026
A
Verified Purchase
Abbe
Port Orchard, US
★★★★★ 1
PVC hose with high PHTHALATES, quickly develops black MOLD
Style: Standard Grip, Size: 3ft, Color: Chartreuse, Style: Standard Grip, Size: 3ft, Color: Chartreuse
TL, DNR
; PVC hose from Taiwan with a high level of toxic phthalates
; invaded by ineradicable sticky black mold in a few months
; the aluminum fitting can fuse to brass spigots by corrosion
; an unfriendly warranty, utterly distrustful of their customers.
UPDATE. By early 2026 none of the health risks associated with this hose have decreased and remain a matter of high concern, particularly under the light of medical studies of phthalate toxicity.
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These are garden hoses produced by a company in Taiwan, which was listed in the past as a buyer of recycled plastic scrap. They are sourced by the marketer Weems Industries Inc. (IA), also doing business as Legacy Manufacturing Co., and sold under its Flexzilla brand.
MATERIAL.
The hyped "hybrid polymer" of Flexzilla hoses is just a plasticized polyvinyl chloride [PVC] compound. The hose consists of three layers. As described below, the analysis of a Flexzilla hose by a third-party professional lab discovered a high concentration of phthalate esters in all layers. Phthalates are toxic chemical additives widely used to make PVC flexible, and the lab finding indicates large amounts of PVC, even in the innermost layer touted as safe for water drinking.
WATER SAFETY.
In general, a PVC hose is much more likely to contain toxic contaminants (such as heavy metals, flame retardants, and phthalates) than a non-PVC hose, in particular when the PVC were recycled, and this is relevant to water safety. I did not find in the Legacy nor the Flexzilla website verifiable evidence supporting the PR pitch that the hoses are safe for water drinking. But in response to a 2017 customer query about water potability on the old Customer Q&A section --now later replaced by the 'ask Rufus' A-- Legacy claimed "the hose meets or exceeds the standards set by the National Sanitation Foundation" (amzn.to/2LCiKT6), which is a testing and certifying group that changed its name to NSF International more than 30 years ago.
Nonetheless, at the time of this review, the NSF website does not list Legacy, Weems, or Flexzilla among those with NSF-certified products. Since the Legacy's claim could have meant testing by another party for conformance to water health-effect standards, I further searched the Web for NSF/ANSI test reports of Flexzilla hoses. I did not find any. But what I found was the _Garden Hose Study 2016_ from the Ecology Center (MI), a 55-year-old independent organization that tested 200+ hoses, including a 50-ft 5/8" Flexzilla garden hose whose material is listed just as "PVC". Multiple phthalates were detected in all layers of the hose, so --contrary to Legacy's touts of safety-- the hose was rated "HIGH" for phthalates, and received the negative evaluation of a "high overall level of concern" (see my figure with such test results).
TOXICITY.
Phthalates are additives for softening the PVC's vinyl and making it flexible. They are soluble in water and not bound to the vinyl, so they can easily leach into the water or the surface of a PVC hose, quite particularly if the hose were heated up by the sun. Phthalates can break down and enter the body via contact with the skin, along with ingestion or inhalation, where they act as estrogen-like anti-androgens. Exposure to them has been linked to feminizing effects on males by acting as endocrine disruptors, being able to reduce testosterone levels and impact hormone-sensitive brain development. Medical research has linked phthalate exposure to reproductive problems (PMID: 32961939), breast cancers (PMID: 30995175), and cardiovascular disease (PMID: 37269565). In fact, a global study of April 2025 estimated that about 350K heart-disease deaths were caused in 2018 alone by one phthalate still in use for tubing and other flexible plastics, even though it has been reported to cause chronic inflammation of arteries including those in the heart. These and others phthalates are commonly present in numerous other products. Despite this, only seven of the many industrially produced phthalates are restricted in the US (15 US Code §2057c), but just in products for children under 3 years of age, and toys for under 12.
Be aware the current NSF/ANSI/CAN 61 standard does consider phthalates. This standard's purpose is to ensure that products and materials in contact with drinking water do not leach harmful contaminants into the water at unsafe levels, including phthalates. Further, all products sold in California containing any of a number of phthalates must display the Prop. 65 Warning: "this product contains one or more chemicals known to the State of California to cause cancer and birth defects or other reproductive harm", and Health & Safety Code notices of violation have been publicly filed against Legacy or Weems, or both, about phthalates in their products in that state. In spite of a clear familiarity with Prop. 65, Legacy did not disclose the warning on its Amazon webpages over several years. Further, Its reaction to queries about phthalates posted on the old Customer Q&A ranged from simply ignoring them, like a 2014 query (amzn.to/3cbugD9), to answers containing false claims that were never corrected, despite ample opportunity to do so, like its 2017 reply claiming the Flexzilla hose was "phathalate [sic] free" (amzn.to/2D5xQjT). Finally, perhaps relenting to criticism of non-transparent practices, in 2021 Legacy disclosed the Prop. 65 warning as a "Legal Disclaimer" above the Consumer Reviews section of this webpage. But even that was sloppily done -- in 6/2021, the warning did not appear if the 100-ft hose were selected; in 7/2022, it did not appear for the 50-ft, 75-ft, and 100-ft hoses; and in 1/2023, it again disappeared for the 100-ft hose. All diameter and length models of Legacy hoses deserve the toxicity warning.
MOLD.
Legacy claims the hose's outer layer "resists [...] mold". Nonetheless, about 4 months after I attached the new hose to a reel (so it was kept dry off the grass or any other wet surface), it began developing black mold, first only on its surface but later deeper. One of my attached pictures (taken after rubbing the hose with a dry paper towel to remove dirt) shows the initial surface mold, while its inset shows the same hose at the time it was installed. Not long after that, handling the black-moldy hose left sticky dark stains on my hand. This fungal invasion is neither an isolated nor a rare case, as evidenced by the large number of reviews here complaining about it (or as a "sticky goo" when touched).
Mold-invaded objects are a potential health risk, and mold development in the hose's inner surface is a _major_ water safety risk. Black mold can produce highly potent mycotoxins, trichothecenes, which can reach harmful levels depending on fungal strain and growing conditions, and it can also release millions of tiny spores causing lung, ocular, and skin reactions in sensitized persons. Plasticized PVC is susceptible to fungal attack since the additives serve as a nitrogen or carbon source. The hose needs to be flushed thoroughly to wash away the mold flecks in the standing water inside. With a melamine sponge, I could remove some mold on the surface but not deeper in the tube's wall or inside -- surface cleaning is but a temporary cosmetic fix: the mold returned even after I removed the hose from the spigot and kept it in the garage. This is shown in my third photo, taken some months after having removed the moldy hose (which was hung in position for the sake of taking the picture).
I contacted Legacy and spoke over the phone with a Tech Support agent, who told me, with the polite laconism recommended for legal cross-examinations, that the company does not deal with the mold invasion. After pressing the issue of health risks for my children, I was told "no mold was found in the inside of a moldy hose" Legacy claims to have cut open. Evidence of such a dissection or its results are not publicly available. In contrast, reviews here show the mold can indeed develop inside the hose. My opinion is that the company could hardly be more apathetic in relation to the potential health risk of the hoses it sells.
WARRANTY.
Its terms are customer-unfriendly. A defective hose would be replaced if you: [1] fill a form online ; [2] cut off both ends of the hose ; [3] cut off its defective part ; [4] cutoff the print band "Flexzilla by Legacy 5/8" ID Type 150 PSI W" on the hose, along with the 4-digit number ; and [5] mail the cut pieces to Legacy at your expense, along with [6] the proof of purchase and return mailing instructions.
The hose has aluminum fittings, but no warranty coverage is provided for the highly likely possibility of the fitting _fusing_ to the brass thread of typical US house spigots due to galvanic corrosion. According to the Legacy's Tech Support, but not affirmed by judicial opinion, the mold development is not covered by the warranty -- tough luck for customers who bought hoses that became Moldy Black, a color quite unlikely to be trademarked by Weems anytime soon. It is censurable that Legacy imitates the three legendary Japanese monkeys, albeit changing the proverb to SEE NO MOLD, HEAR NO MOLD, SPEAK NO MOLD, and it is fair to conclude Legacy considers the development of mold too frequent to be covered by its unfriendly, penny-pinching warranty.
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