Girodisc Front 2-Piece Floating Rotor Set - E46 M3, E85/E86 Z4MGirodisc 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 These Girodisc 2 piece rotors are a direct
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
These Girodisc 2-piece rotors are a direct replacement for the E46 M3 345mm rotor found on Competition Package (ZCP) and CSL models. Weighing in at 17.5 lbs per rotor versus 19 lbs per factory rotor, these fully floating assemblies help shed unsprung weight and rotating mass from the front axle of the vehicle.
The rotor rings are machined from a proprietary casting made of high-carbon steel formulated to Girodisc’s specifications. This superior metallurgy results in a rotor that holds up better, and the 48 curved vanes act as a centrifugal pump pulling air in through the hub to effectively cool the rotors under hard use. The 2-piece design means a reusable hat which can be attached to new rings (part number D1-012) when they need to be replaced.
All major components including the hats, rotor rings, and drive pins are manufactured in-house at Girodisc's facility in Bellingham, WA from domestically sourced materials. The hat is made from 6061-T6 aluminum and coated in a black anodize finish. The drive pins are made from a high-strength steel alloy and cadmium-plated for corrosion resistance. All rotors are assembled with spring clips and Belleville washers for race-ready float while also being street-friendly with no noise from loose hardware.
Our E46 M3 rotors have been designed with common aftermarket caliper setups in mind, in addition to the stock sliding calipers available on ZCP and CSL cars. These setups include the Brembo calipers from both the Porsche 996 and Megane RS swaps.
Diameter: 345mm Thickness: 28mm Weight: 17.5 lbs per rotor assembly
The minimum thickness at which we recommend replacing these rings is 26mm. We also recommend replacing them if a crack leads to the edge of the ring.
Sold/priced per pair.
Fitment Information
This application is only for E46 M3 Coupe and Convertible, E85 Z4M Roadster and E86 Z4M Coupe models fitted with the ZCP or CSL braking system.
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).
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
3 Series / E46 (1998-2006) / M3
3 Series / E46 (1998-2006) / M3 CSL
Z Series / E85 / E86 Z4 (2002-2008) / Z4M
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]
This is not a sponsored review:
I have tried multiple wireless thermometers for the last few months. I smoke meat every week and knowing the temperature of the meat is extremely important. Having WiFi for them is a game changer. I never had any disconnects and the temperature of the meat was just spot on. I made a pork loin for the first time with it. It told me the ambient temperature and I could see when the projected cook was done. It was the juiciest pork loin I have done. The display was easy to tell and read without having to pull out my phone. The app was easy to read as well. The professional app setting was amazing to see the differences between the 6 sensors all the way down to tenths of a degree. I also got the instaprobe as well. This thing is so fast to read the temperature. It reads an accurate temperature in less than a second.
The company is a small upcoming company based in the United States which was a plus for sure. They maybe new to the game but they will definitely make a splash coming soon. It maybe a little more expensive than other wireless probes but it is definitely worth the money.
Update after using for a while. I have had no issues at all with the product. The WiFi is amazing and almost never disconnects. The batteries are able to last through the 18-20 hour smoke without charging again. The temps are spot on. After using the Typhur Sync, the meat I have made have came out so much juicier and not dried out at all. The time to put the meat sensor is spot on. I could not recommend this company and its products enough.
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Reviewed in the United States on January 23, 2024
D
Verified Purchase
Darryl Richman
Boise, US
★★★★★ 5
Easy to use by itself or with the App
Size: 2 Probes
==Update 4/5/25 =====================
Last summer Typhur ran a sale for the Sync Quad, so I bought that and gifted the Sync to a friend. (It's still going strong.) The Quad has the same features, but with four probes, which are a bit thinner than the original Sync. I really like that the probes can go in the dishwasher, and the base unit is cleverly designed to display the probes while charging them (which is quick). The device and app both get regular updates. A few months ago the device got the ability to control the volume of the alarms it makes, and recently the app added a feature to allow notes to be added to recorded cooks, for example.
==Original review from 1/20/24 =====================
I've had the Sync for a month and a half now and am super pleased with it. It replaces an Inkbird remote thermometer with wired probes, which had been my go to for several years, but it didn't like being outside in the rain for a long cook. Because the Typhur Sync has wireless probes, I can leave the base in my kitchen out of the weather (even though they claim that the base is waterproof, too.) The cook time prediction is pretty close and allows me to get my sides prepared so everything comes to the table at the same time. The remote connection to my home wifi is strong and never fails. The App on my Android phone is fast to connect and easy to use. It has a "pro" mode that lets you see what each individual temperature sensor is reading, so if you're smoking a big prime rib like I did over Xmas, you can actually see how done it is from the outside in. Because the probes are wireless, you can insert them while inside where the light is good before going out to the grill in the dark. I've used it in my oven too, and it works just as well.
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Reviewed in the United States on January 20, 2024
M
Verified Purchase
Matt Brown
Boise, US
★★★★★ 4
Accurate and Durable – A Game-Changer for Long Cooks!
Size: 2 Probes
After a lot of research, I decided to invest in this wireless meat thermometer, and I’m really glad I did. My first cook was a brisket, and it helped me keep an eye on the temperature with ease. The durability of these thermometers is impressive – they feel solid and built to last, even with regular use around the heat and elements of a smoker.
In terms of accuracy, they’re spot on. The temperature readings have been reliable, which is essential for any serious BBQ enthusiast. These thermometers take the guesswork out of smoking, and they really do work well.
The only downside I’ve noticed is occasional connectivity issues. A few times, the connection dropped and it stopped reading, which I’m still troubleshooting. I’m not sure if it’s due to the distance, as the reader is usually inside the house, or if there’s another factor at play. However, I learned that for long smokes, it’s smart to alternate between the two thermometers to keep them charged and ready for the duration.
Overall, these thermometers have been top tier, making smoking and grilling much easier and more precise. If you’re willing to keep an eye on the connection, this is an excellent addition to any BBQ setup.
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Reviewed in the United States on November 3, 2024
J
Verified Purchase
Jason Lee
Waukegan, US
★★★★★ 5
A must-have high-tech gear for cooking
Size: 2 Probes, Size: 2 Probes
I've been looking at wireless thermometers for while but was unsure about which brand to choose. Then I saw someone on YouTube use the Sync to cook a Christmas turkey and decided to give it a shot. The youtuber didn't just cook the entire turkey as a whole. Instead he cut it into different parts, and cooked them simultaneously at two different durations for optimal results. This was ingenious as dual probes can be extremely helpful for certain foods that require different doneness, and this thermometer monitors both the internal temperature of the food and the ambient temperature.
Fast forward two weeks in, and I'm in love with this thermometer. Even though I have an instant food thermometer, I still find myself using the Sync more because you can leave the probe in to get readings instead of having to manually stick the probes in like you would with a traditional food thermometer. As an experienced chef, even though most foods look cooked on the outside, you can never really judge their internal doneness without a thermometer.
1. Highly accurate: Each probe has 5 sensors for multi-zone temperature readings ensuring the lowest point of the internal temperature is displayed with accuracy down to the decimal. I cowitnessed the readings with a high-end instant-read thermometer, and all the readings were consistent with each other. It also comes with an external ambient temperature sensor which is important because, ambient temps may vary in different parts of the oven/smoker/grill. I cowitnessed the ambients temps as well and they were also consistent.
2. Easy to connect: It can easily connect to my phone via wifi or Bluetooth. Once set up, it's super easy to use every time.
3. Stable connection: The wifi or Bluetooth connection is very stable. I've used Sync in a smoker for several cooks now, and even when it was wrapped in foil with a the lid of the smoker on, it never lost connection. There were no complex syncing issues or signal losses.
4. You can monitor the cooking progress from anywhere in your home where you can take your phone or tablet. You don't have to stay in the kitchen.
5. You can set preferences for various alerts via the app.
6. The built-in cooking time estimator is great when you're in charge of larger meals or just want to know when to lower the heat. The app will tell you when the food is done and allow a rest period for the temperature to rise. For example, if you want a medium steak and set the temperature to 135℉, the app will tell you the steak is done when it reaches 130℉ and to allow a 3-5 minute rest period for the temperature to rise to 135℉. This means you can cook proteins perfectly every time.
7. It has a large base screen that's easy to read.
8. Charging is very convenient. Just plug in the charging cable to charge the base, and stick the probes into the base to charge the probes.
9. You can select a preset in the app modify it according to your preferences.
10. Customer service. Initially, when my Sync was not charging, I contacted customer service. To my surprise, they responded quickly and offered to replace the device for free if it was defective. I was very impressed with their quick response and friendly attitude.
11. The 3-year warranty is a nice bonus.
Hopefully this review has been helpful. I'll update this review if my views change or I find more ways to use it. If you're concerned about the price being higher than entry-level products, then you probably haven't taken the time to read this.
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Reviewed in the United States on February 15, 2024
B
Verified Purchase
Boma
Charlottesville, US
★★★★★ 5
Efficient, accurate, and thoughtfully designed
This instant-read thermometer from Typhur does exactly what it promises, quick, accurate readings with no fuss. It’s fast, reliable, and has become one of those tools I reach for constantly in the kitchen.
The display is bright, clear, and easy to read. It even auto-rotates based on how you're holding it, so the numbers are always right side up, no more twisting your neck trying to read upside-down temps.
One of my favorite features is the magnetic back. Being able to attach it to the fridge keeps it visible and within arm’s reach when I need it most, no digging through drawers mid-cook. It’s a small detail, but one that adds a lot of everyday convenience.
Unlike some of Typhur’s other products that charge via USB-C, this one runs on batteries. At first I found that a little unusual, but on second thought, I actually appreciate it. No internal battery means no long-term degradation, just pop in fresh batteries when needed and keep it going. That kind of longevity makes sense for a kitchen tool like this.
Best part? I scored it on sale for under $40, which was a steal. Even at its current price point around $100, it still feels fair for the quality and performance you're getting.
Highly recommended if you’re looking for an instant-read thermometer that blends speed, accuracy, and solid design.
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