Girodisc 350x28 Rear Brake Discs for Alfa Romeo Giulia - Stelvio Quadrifoglio without CCB (2016+)

The Girodisc A2-224 rear brake discs, measuring 350 × 28 mm, improve thermal management during repeated braking on the Alfa Romeo Giulia Quadrifoglio (2016+), Alfa Romeo Stelvio Quadrifoglio (2016+), and Maserati MC20 (2020+). Their cast-iron tracks and aluminum bowls form a floating assembly designed to manage thermal stresses and facilitate the replacement of tracks under wear. Sold in pairs, with one left and one right disc.

These rear discs are intended for the rear axle of compatible vehicles in the configuration shown below. They retain the compatible caliper mounting; any required spacers and brake pad specifications must be observed.

The curved internal cooling fins channel air through the rotor to dissipate heat during repeated braking. The floating mounting limits stresses caused by differences in thermal expansion between the rotor and the housing and helps the rotor center itself between the brake pads, maintaining consistent contact under heat.

The hub is made of 6061-T6 aluminum. The high-strength steel drive pins are cadmium-plated to resist corrosion. They are secured by Class 12.9 bolts and hardened washers. Spring washers minimize cold-mounting noise while allowing the necessary compression for the floating mount.

New pads must be installed with new discs or tracks. Their shape and compound must be compatible with the mounting, the cast iron, and the intended use; comply with the specific requirements for this part number and perform the prescribed break-in procedure.

Specifications for Girodisc A2-224 rotors for compatible vehicles

• Brand: Girodisc
• PartNumber: A2-224
• Position: rear
• Sizes (diameter × thickness): 350 × 28 mm
• Vehicles and models: Alfa Romeo Giulia Quadrifoglio (2016+); Alfa Romeo Stelvio Quadrifoglio (2016+); Maserati MC20 (2020+)
• Braking surface: high-resistance cast steel
• Packaging: Pair of complete rotors, one left and one right with disc bells.
• Housing: 6061-T6 aluminum
• Construction: two-piece floating mounting design
• Catalog part number: D2-224. Verify compatibility with the caliper generation before replacement.
• Internal ventilation: directional curved fins
• Minimum thickness: 20 mm
• Original rotor diameter: 320 mm
• Manufacturing of main components: United States

Vehicles compatible with Girodisc part number A2-224

• Alfa Romeo Giulia Quadrifoglio (2016+)
• Alfa Romeo Stelvio Quadrifoglio (2016+)
• Maserati MC20 (2020+)

• Alfa Romeo Giulia Quadrifoglio (2016+): For stock cast-iron brake rotors, excluding carbon-ceramic rotors.
• Alfa Romeo Stelvio Quadrifoglio (2016+): For stock cast-iron brakes; does not include carbon-ceramic brakes.
• Maserati MC20 (2020+): Excludes carbon-ceramic brakes.

Each application is subject to its specific brake system, calipers, and any requirements for brake pads or spacers. Please verify these requirements before ordering.

Girodisc A2-224 Mounting Requirements

• Alfa Romeo Giulia Quadrifoglio (2016+): For stock cast-iron brake systems; excludes carbon-ceramic brakes.
• Alfa Romeo Stelvio Quadrifoglio (2016+): For stock cast-iron brakes; excludes carbon-ceramic brakes.
• Maserati MC20 (2020+): Excludes carbon-ceramic brakes.

Brake Pads and Brake Systems for Compatible Vehicles

Choose brake pads whose shape is compatible with the calipers, track, and/or A2-224 rotors, and whose compound is suitable for sport driving or track use. The Endless, pagid Racing, or Ferodo Racing ranges may be considered after verifying the appropriate part number.

For intensive use, we recommend compatible aviation-grade flexible hoses and high-performance brake fluid that meets the vehicle’s specifications, along with proper bleeding and fluid replacement. This recommendation complements the mounting, which is compatible with the original hydraulic system.

Maintenance of the Girodisc mounting on compatible vehicles

Replacing the pads alone helps keep the controlled rotors in good condition. Reusing a rotor for up to three pad replacements is subject to inspection of its condition, its mounting components, and the mounting instructions; this number does not constitute a guaranteed service life. Use a new mounting component each time you replace the pads.

FAQ — Girodisc A2-224 for compatible vehicles

What are the sizes of the A2-224 discs for my vehicle? The part number shown measures 350 × 28 mm and is mounted on the rear axle. The diameter alone is not sufficient: also check the brake system type and mounting requirements.

Is the product sold in pairs? Yes. It includes a left and a right disc for the same axle. Both discs are shipped with their disc bells.

Do I need to replace the brake pads on my vehicle?Yes. Always install new brake pads with new rotors or new braking surfaces. Their shape and compound must be compatible with the A2-224 track and/or rotor and with the calipers. Then break in the rotors and pads according to the prescribed procedures.

How do I identify the left and right sides? Girodisc rotors come with a label attached to each rotor: LEFT for the left side and RIGHT for the right side, as viewed in the direction of travel. On a left-hand-drive vehicle, “LEFT” corresponds to the driver’s side and “RIGHT” to the passenger side. Follow these labels and the instructions. On models with curved internal fins, the rolling direction depends on this internal ventilation; the surface grooves alone are not sufficient to determine the side.

How do I break in this mounting on my vehicle? Follow the Girodisc procedure and the brake pad manufacturer’s instructions to build up an even transfer ply. The PDF documents below detail installation and break-in.

PDF Documents for Mounting and Break-in

We have included two PDF documents below: an instruction manual for installing and breaking in the discs, and an instruction manual for installing new tracks on existing bowls. Consult the document that applies to your specific task before you begin.

Key Features of Girodisc A2-224 Bowl Brake Discs

• 350 × 28 mm size for rear braking on compatible vehicles.
• 6061-T6 aluminum rotor and floating mount to manage thermal stresses.
• Internal ventilation via curved fins to dissipate heat.
• Replaceable brake pads to maintain a two-piece mounting.
• Left/right pair identified for mounting.
• Aluminum rotors help reduce unsprung and rotating mass compared to a comparable one-piece cast iron disc.