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Description
Girodisc Rear 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]
Size: 3 Fl Oz (Pack of 2), Style: SPF 30, Size: 3 Fl Oz (Pack of 2), Style: SPF 30
Reliable, long-lasting protection. I’ve used this for workouts, beach days, and long hours outside, and it holds up really well. It absorbs quickly, and actually stays on when you sweat. Great value for the size and performance. Definitely a go-to sunscreen for active days. I like the small size. It is easily portable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 2, 2026
A
Verified Purchase
Amy Sarah
Charlottesville, US
★★★★★ 5
Shear and effective. Excellent!
Size: 3 Fl Oz (Pack of 2), Style: SPF 30
Shear, effective. Excellent.
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Reviewed in the United States on May 3, 2026
C
Verified Purchase
Curly and Cruelty Free
Pawtucket, US
★★★★★ 4
TSA approved but…
Size: 3 Fl Oz (Pack of 2), Style: SPF 30
I’m not super picky when it comes to sunscreen and I needed a sunscreen that would be TSA approved. This fit the bill and didn’t break the bank (getting a 2 pack is nice as well). However, I find that this sunscreen just underperformed for me. It could be that I should up the SPF factor but when using my usual brand their 30 works a bit better than Banana Boat’s version. I wouldn’t say that this product is useless because it did prevent burning in certain areas but I still burned a bit in other areas. However, this could be my fault. I was outside for about an hour with 9 UV rays in a bikini in the California sun. I will say that I did reapply before 2 hrs so I’m just a little bit let down that it didn’t quite perform a bit better. But again, could be user error and perhaps just be really particular about your application technique.
If you’re in a pinch, go for it but I’d honestly even recommend upping your SPF factor if you are set on Banana Boat’s while still meeting the TSA sizing requirement. Smells good though and isn’t the stickiest compared to some of the other brands!
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Reviewed in the United States on July 11, 2025
D
Verified Purchase
Dennis King
Fort Morgan, US
★★★★★ 5
Works well
Size: 3 Fl Oz (Pack of 2), Style: SPF 30
Good product
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Reviewed in the United States on April 29, 2026
C
Verified Purchase
Chris
Houston, US
★★★★★ 5
Good sunblock. New bottle design with easy to read expiration date.
Size: 8 Fl Oz (Pack of 1), Style: SPF 30
When reviewing this product. It ask you to put a STAR for:
Sun protection
Water resistance
I put 5 stars because, how would i know? I don't use it to go into water and you'd need to be a scientist testing how good the sun protection is. I just assume it works.
But i've used banana boat sunblock in the past. And it's been fine. No sunburns. As long as you remember to re-apply it because it's not meant to last all day.
Pros:
- It's sunblock
- It works (from my previous experience)
- New bottle design.
They changed the style of the bottle. The new bottle has the date on it. The old bottles only had a serial number. In order to find out if your old bottles are expired you had to go to the banana boat website and see the instructions on how to read the serial # that way you can know the expiration date.
The new bottle is more simple, the date is laid out easy to read on the bottle.
- Long expiration date:
I bought this sunblock around april or may of 2020 and the bottle says it will expire January 01, 2022
- Nice slim bottle to fit into a small bag.
Cons:
- It's a small 8 FL OZ bottle. My old bottle is a 10 FL OZ. Not sure if they still sell the 10FL OZ.
- It feels a little heavy and thick on the skin. But after a while it's fine.
- If you rub your hands / fingers around your eye, especially if you're sweaty. You might get the sunblock into your eyes. That has happened to me on hot summer days. It will make you teary eyed and irritate your eyes for a long while.
- I hear this sunblock may stain clothes. So far that has not happened to me.
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and
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