Girodisc Front 2-Piece Floating Rotor 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 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 withblue calipers and iron rotors. Not suitable for models fitted with silver/red M-Sport brake package (S2NH) or M Carbon Ceramic brake package (S2NK).
Girodisc Rotor Construction
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 dont really write reviews but really felt like I needed to hop on here and give one. I have a terrible time finding bras that fit (small frame and my boobs never shrunk back down after having kids). I was initially looking for a non-underwire bra and ordred a couple to try. Was annoyed when this came in having underwire but thought ok, well its here so may as well try it. Fit like a dream so I told myself, Ill wear it for an hour and see how I feel about it then. I totally forgot I was wearing it. It is SO comfortable. The back doesnt ride up, I dont have underboob, it breathes nicely, holds me up, straps dont dig in or fall down, and I dont feel a huge sense of relief after taking it off at the end of the day. Ive ordered two more and after a few weeks of wearing and washing a couple times, I still absolutely love it.
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Reviewed in the United States on April 9, 2026
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Scott Gnixon
Massapequa, US
★★★★★ 5
The PERFECT bra!
Size: 38D, Color: Barely Buff
I typically don't write reviews...but I just had to with this bra! I have not worn an underwire bra in years. I have had such a hard time finding something that is comfortable, supportive and does not allow for overflow. This bra is perfect! The material is soft and stretchy. It covers everything and does it comfortably! It also provides a perfect lift! The color is a perfect skin tone. Pretty sure I will be buying more!
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Reviewed in the United States on February 24, 2026
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suzieQ
Fort Morgan, US
★★★★★ 5
SUPER SOFT!! I'm impressed with how amazing this sheer bra feels on!!
I already loved Delimira front closure bras so thought I'd try these sheet mesh ones with Valentine's day coming up. Wow, was I super happy! The "mesh" that I have found scratchy on other brands was SUPER SOFT on this one. It's a stretchy fabric, but definitely is giving my C cups support. The size fit exactly as the other Delimira bras fit me. The shoulder straps feel wonderful too -- that's an added bonus. I was worried the back would be too much material and/or feel weird, but I loved how it felt and the coverage will make for zero tugging. This design is fantastic! As soon as I tried it on, I immediately ordered more colors and now have the light purple, red, white, and teal blue!! Oh and yes, it's sheer and will show your nips (some colors more than others), but not through a shirt. It provides the same coverage as other unlined bras under shirts. If you want a sexy bra that's comfortable too, this is it! My only complaint is that all the hardware on the bras are GOLD, no matter which color you order. I would prefer silver.
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Reviewed in the United States on January 3, 2026
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NH
Massapequa, US
★★★★★ 5
Comfy but don’t expect too much support
Size: 40F, Color: Snow White
Closure was a little stiff until I used it a few times. Fit was as expected; posture back feels good. Underwire isn’t uncomfortable at all. Mesh material is breathable and soft. Doesn’t provide real strong dupport so if that’s what you’re looking for you might be disappointed.
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Reviewed in the United States on May 11, 2026
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Mary La Og
Port Orchard, US
★★★★★ 3
Delimira posture front closing bra
Size: 40DD, Color: Sargasso
This bra is great however there’s room to make it better. There is great back support & coverage of back fat as well as side fat. The strap is thick & comfortable. The strap stays in place also. The front closure is a plus however what does make it uncomfortable is the wire due to the length & the material needs to be thicker or maybe the wire should be some other material. The other part of it being uncomfortable is that the cups run oddly smaller & I sized up so if I go up another size the bra will be too big & not stay in place. This bra with some work could be excellent though.
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Reviewed in the United States on November 15, 2025
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