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Description
Girodisc Rear Replacement Rotor Ring Set - E9x 335iGirodisc 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.
HDR:
Windows 10/11 report 1015nits peak brightness which is its real peak luminance.
Quantum HDR2000 is a fabricated specification unique to Samsung. In real content (games/movies) it is no where near capable of 2000nits and instead barely produces over 800nits peak brightness for 10% highlight. The 2000nit figure comes from best case scenario - 10% test slide used by calibrators and reviewers to measure luminance. The monitor detects such a scenario and temporarily boosts brightness so that they can publish impressive brightness figures. Yes this is essentially cheating and Samsung has been called out recently for the same "trick" on their TV's.
Samsung could have opted to have the monitors HDR performance certified by VESA but chose not to in favor of their own marketing favorable terminology. In reality the monitor is some where between VESA DisplayHDR600 and DisplayHDR1000 due to a combination of Samsung severely limiting brightness for the sake of preventing blooming alongside possibly preventing the backlight from being overdriven to manage thermals.
Scanlines:
The monitor displays horizontal scanlines at its maximum 4K 240hz refresh rate. This is a limitation of the display driver or scaler and has been present on all 1440p+ 240hz Samsung monitors dating back to the original G7. This is not a software/firmware issue as the original G7 and Neo G9 still suffer from it to this day after over a dozen firmware updates between the two.
Dropping down to 120hz rids you of scanlines but then you have to ask, why did I buy a 240hz display? A compromise is using a custom resolution/refresh rate of 165hz but then you have to ask yourself, why didn't I save $200 and purchase the Neo G7 instead? Anything above 165hz and the scanlines get very noticeable.
Anti Reflective Coating:
The Neo G8 uses a completely different AR coating compared to the Neo G7. Its extremely thick/hazy and has a sparkly sheen to it and as a result is a huge detriment to clarity.
HDMI 2.1:
As of right now the monitors HDMI 2.1 ports are either broken due to a firmware mishap or not full bandwidth HDMI 2.1 ports. 4K 120hz is the max possible refresh rate using an HDMI 2.1 capable GPU and even that can be finicky at times. DSC should make 4K 240hz possible just like the Displayport 1.4 port but its just not working correctly at the moment.
Curve:
The curve is non uniform and extremely aggressive at the center while flattening at the sides. It results in a very odd almost crease like presentation dead center and takes quite a bit of adjustment. I understand the 1000R curve is done to compensate for the VA panels poor viewing angles but its just too much for desktop/productivity and warps everything you're looking at. 1800R or 1500R max would be ideal although I wish Samsung would ditch this obsession with curves and just give us flat panels.
Neo G7 vs Neo G8:
So why buy the Neo G8? Well there really is no reason unless you enjoy horizontal scanlines at 240hz. The Neo G7 has the same HDR brightness (1015nits reported to Windows), gets you 165hz scanline free without having to fiddle with custom resolutions, uses a more traditional matte anti glare coating and as of writing this review appears to have the same HDMI 2.1 limitation.
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Reviewed in the United States on June 30, 2022
S
Verified Purchase
Steve B.
Chelsea, US
★★★★★ 5
WHAT YOU NEED TO KNOW! And why people have issues with this Monitor, It's their fault.
Got mine today! Great packaging, no dead pixels! LOOKS AWESOME!
This is what you need to know before buying this Monitor! Please read SO YOU KNOW! It will also help you with any other monitor, video card, or cables.
This is a 4K 240Hz Monitor! There are 3 different versions of this Monitor in the user manual, and Samsung has never been great on literature to know what you need to push this monitor to its full potential. I read the 4-star reviews for this Monitor first. In there, I read about a guy who was getting tearing and replaced the DP (Display Port) cable to a 16K cable. I want to explain this to educate people and help.
The base refresh rate for any resolution is 60Hz, so let's do the math backwards to fully understand. 16K at 60Hz = 8K at 120Hz = 4K at 240Hz = 2K at 480Hz
Since not only Samsung, but every corporation tries to save money, the other 2 monitors in the user's guide doesn't require a 16K cable. Since I'm sure they all have the same packaging, there's no reason to believe the supplied DP (Display Port) cable is 16K. In Fact, I can see nothing on the cable that says so. However, I spent $6 for a 10' 16k cable delivered with the Monitor.
This is the most important thing to know once you have your 16K DP (Display Port) cable. To push 16K your device (Video Card) has to have DP (Display Port) 2.1
AMD was on top of the ball on this and uses DP (Display Port) 2.1 for its RX 7000 series and up. I use a RX 7900XTX, so I'm covered. Nvidia used DP (Display Port) 1.4 on their RTX 4000 series cards to save money and charge you way too much! Nvidia implemented DP 2.1 on their RTX 5000 series cards. I don't know for INTEL cards; I would search the specs. I've read reviews from RTX 4000 people, and I can only assume that they don't understand that Nvidia DLSS has to be a factor, they aren't aware that their video cards can't push a true 4K at 240Hz.
The last thing to add is the Dimensions that Samsung Provides! Yes, its 27" tall! But it's a telescopic stand, I only have 20.5" clearance, and it fits nice. I think it could go down to 19".
Power Color Hellhound RX 7900 XTX
AMD 9950 X3D
Asus Rog Strix X870E-E Gaming Wi-Fi
32GB G.Skill Royal Neo at 8000Mhz
Nothing else is important for this post
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Reviewed in the United States on July 15, 2025
A
Verified Purchase
Amazon Customer
Omaha, US
★★★★★ 5
Music and video editing. This thing works.
Size: 49-1, Size: 49-1
49" curved. It's a good monitor. Confirmed resolution is 5K. I had never heard of ZZA before but the reviews were good and the price was decent. Honestly, I did not expect too much. Well, this monitor is well packaged, easy to handle and use, built nicely. The screen has a matte low-reflection surface and looks smooth. Tested with Ableton, DaVinci, WOW, Zoom, and a few others. Instantly improved my workflow by displaying longer timelines in music and video. Games like WOW are very immersive, but it takes a few hours to get used to. Once you get into it, it might be had to go back to a normal flatscreen. Overall, it's worth the money. ZZA is evidently taking this very seriously with a decent design and a solid feel. Would recommend.
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Reviewed in the United States on February 2, 2026
T
Verified Purchase
Trisha Hagensick
Chelsea, US
★★★★★ 5
Great monitor
Was looking for an extra monitor to use for when working from home. The picture quality is perfect for just normal work use. The ports are easy to access for plugging in cords. Was easy to set up with the docking station as well. Worth the money.
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Reviewed in the United States on April 28, 2026
H
Verified Purchase
Hudson Rechsteiner
Phoenix, US
★★★★★ 5
Great Screen
Size: 27
For the price, you can not beat the picture quality. It is great for me and is a perfect size for warzone.