# Girodisc 390x34 Front Brake Discs for Alfa Romeo Giulia - Stelvio Quadrifoglio with CCB (2016+)

> Pair of Girodisc front disks, 390 × 34 mm, part no.: A1-209. High-performance floating brake discs on an aluminum hub for the Alfa Romeo Giulia Quadrifoglio with CCB (2016+); Alfa Romeo Stelvio Quadrifoglio with CCB (2016+).

- URL: https://www.gt2i.com/en/brake-disk-for-bell/224537-girodisc-390x34-front-brake-discs-for-alfa-romeo-giulia-stelvio-quadrifoglio-with-ccb-2016-3666618858623.html
- Reference: GIRO-A1-209
- Price: €2,054.40
- Brand: GIRODISC
- Availability: out of stock

## Description

The Girodisc A1-209 front brake discs, measuring 390 × 34 mm , enhance braking endurance during sustained use on the Alfa Romeo Giulia Quadrifoglio with carbon-ceramic rotors (2016+) and the Alfa Romeo Stelvio Quadrifoglio with carbon-ceramic rotors (2016+). Their cast-iron pads and aluminum hubs form a floating assembly designed to manage thermal stresses and facilitate pad replacement due to wear. Sold in pairs, with one left and one right disc.
These rotors are intended for the front axle of compatible vehicles in the configuration shown below. They retain the compatible caliper mounting; any required spacers and brake pad specifications must be followed.
The curved internal cooling fins channel air through the rotor to dissipate heat during repeated braking. The floating mounting minimizes stresses caused by thermal expansion differences 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-trimmed 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 rotors or brake tracks. Their shape and compound must match the mounting, cast iron, and intended use; follow the specific requirements for this part number and perform the prescribed break-in procedure.
On compatible vehicles originally equipped with carbon-ceramic rotors, this pair provides a conversion solution to high-quality cast-iron rotors. It allows you to remove and store the expensive original carbon-ceramic rotors to preserve them during heavy-duty use, while reusing compatible calipers. Use new brake pads suitable for cast iron and adhere to the pad shapes and any spacers specified by the part number. Replaceable brake pads reduce the cost of replacing braking surfaces in heavy-duty uses and offer a choice of trims to tailor bite and pedal reaction to the intended use.
Specifications for Girodisc A1-209 rotors for compatible vehicles
Brand: Girodisc
PartNumber: A1-209
Position: front
Sizes (diameter × thickness): 390 × 34 mm
Vehicles and models: Alfa Romeo Giulia Quadrifoglio with carbon-ceramic rotors (2016+); Alfa Romeo Stelvio Quadrifoglio with carbon-ceramic rotors (2016+)
Braking surface material: 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: D1-209. Verify compatibility with the hub generation before replacement.
Internal ventilation: directional curved fins
Minimum thickness: 32 mm
Original rotor diameter: 390 mm
Manufacturing of main components: United States
Vehicles compatible with Girodisc part number A1-209
Alfa Romeo Giulia Quadrifoglio with carbon-ceramic rotors (2016+)
Alfa Romeo Stelvio Quadrifoglio with carbon-ceramic rotors (2016+)
Alfa Romeo Giulia Quadrifoglio with carbon-ceramic rotors (2016+): For vehicles equipped with factory carbon-ceramic brakes.
Alfa Romeo Giulia Quadrifoglio with carbon-ceramic rotors (2016+): Brake pads with a maximum radial sweep height of 66 mm are required for this track.
Alfa Romeo Stelvio Quadrifoglio with carbon-ceramic rotors (2016+): For vehicles equipped with factory-installed carbon-ceramic brakes.
Alfa Romeo Stelvio Quadrifoglio with carbon-ceramic rotors (2016+): Brake pads with a maximum radial sweep height of 66 mm are required for this track.
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 A1-209 Mounting Requirements
Alfa Romeo Giulia Quadrifoglio with carbon-ceramic rotors (2016+): For vehicles equipped with factory-installed carbon-ceramic brakes.
Alfa Romeo Giulia Quadrifoglio with carbon-ceramic rotors (2016+): Brake pads with a maximum radial sweep height of 66 mm are required for this track.
Alfa Romeo Stelvio Quadrifoglio with carbon-ceramic rotors (2016+): For vehicles equipped with factory-installed carbon-ceramic brakes.
Alfa Romeo Stelvio Quadrifoglio with carbon-ceramic rotors (2016+): Brake pads with a maximum radial sweep height of 66 mm are required for this track.
Brake Pads and Braking System for Compatible Vehicles
Choose brake pads whose shape is compatible with the calipers, track, and/or A1-209 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 calipers in good condition. Reusing a caliper 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 with each pad replacement.
FAQ — Girodisc A1-209 for compatible vehicles
What are the sizes of the A1-209 discs for my vehicle? The part number shown measures 390 × 34 mm and is mounted on the front 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 come 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. Use a compound suitable for cast iron and your intended use. Brake pads with a maximum radial height of 66 mm are required for this braking surface.
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 from 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.
Girodisc A1-209 Highlights
390 × 34 mm size for front braking on compatible vehicles.
6061-T6 aluminum disc and floating mount to manage thermal stresses.
Internal ventilation via curved fins to dissipate heat.
Replaceable pads to maintain a two-piece mounting.
Left/right pair identified for mounting.
Aluminum rotors to control the unsprung mass and rotating mass of the conversion kit.

## Features

- Product type: Brake disc on a Bol
- Diameter in mm: 390
- Position: Avant
- Thickness: 34