The Girodisc A1-173 front brake discs, measuring 355 × 32 mm, enhance braking endurance during sustained use on Tesla Model S & X (2012–2020) vehicles. Their cast-iron tracks and aluminum bowls form a floating assembly designed to manage thermal stresses and facilitate the replacement of tracks subjected to wear. Sold as a pair, including one left and one right disc.
These rotors are designed for the front axle of your Tesla Model S & X in the configuration shown below. They are compatible with the existing calipers; 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 limits stresses caused by thermal expansion differences between the rotor and the hub and helps the rotor center itself between the brake pads, maintaining consistent contact even when hot.
The hub is made of 6061-T6 aluminum.
New brake pads must be installed with new rotors or brake discs. Their shape and compound must match the mounting, casting, and intended use; follow the specific requirements for this part number and perform the prescribed break-in procedure.
Each application is subject to its specific brake system, calipers, and any requirements for brake pads or spacers. Please verify these requirements before ordering.
Choose brake pads whose shape is compatible with the calipers, track, and/or the A1-173 rotor, 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 a mounting compatible with the original hydraulic system.
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 with each pad replacement.
What are the sizes of the A1-173 discs for my Tesla Model S & X? The part shown measures 355 × 32 mm and is mounted on the front axle. The diameter alone is not sufficient: also check the brake system version 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 Tesla Model S & X?Yes. Always install new brake pads with new rotors or new brake pads. Their shape and compound must be compatible with the A1-173 rotor and/or braking surfaces and 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 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 Tesla Model S & X? Follow the Girodisc procedure and the brake pad manufacturer’s instructions to build an even transfer ply. The PDF documents below detail the mounting and break-in process.
We’ve included two PDF documents below: an instruction manual for installing and breaking in the rotors, and an instruction manual for installing new tracks on existing rotors. Consult the document that applies to your specific task before you begin.
