GiroDisc Front Brake Rotors – Porsche 991 GT3 Cup – 380x32mm

Description

GiroDisc Slotted Front Brake Rotors – Porsche 991 GT3 Cup

Upgrade or replace the front brake rotors on your Porsche 991 GT3 Cup with the GiroDisc two-piece floating rotor system.

Designed as a direct replacement for the original 991 GT3 Cup front brake discs, these 380x32mm rotors bolt directly to the car and work with the factory brake calipers without modification.

The GiroDisc system combines a high-performance cast-iron friction ring with a lightweight 6061-T6 aluminum center hat and fully floating mounting system designed for the extreme temperatures and repeated thermal cycling of competition use.

GiroDisc Part Number: A1-238
Rotor Size: 380mm × 32mm
Sold as a pair – left and right front rotors.

Direct Replacement for the 991 GT3 Cup

The A1-238 rotor system was developed specifically for the Porsche 991 GT3 Cup.

No brake-system conversion is required. The complete rotor assemblies bolt directly into the OE location and work with the factory calipers.

This makes the GiroDisc system an excellent replacement or upgrade for cars that see regular track and competition use.

Two-Piece Floating Rotor Construction

Each rotor consists of a GiroDisc cast-iron friction ring mounted to a lightweight 6061-T6 aluminum center hat.

The floating mounting system allows the rotor ring to expand independently as temperatures increase while maintaining proper alignment between the rotor and brake pads.

This is particularly important in a race application where the brake system repeatedly transitions between ambient and extremely high operating temperatures.

Curved-Vane Internal Cooling

The GiroDisc friction rings incorporate a curved internal vane design developed for racing applications.

As the rotor spins, the vane arrangement helps move cooling air through the rotor, improving heat management during repeated high-energy braking events.

Combined with the floating construction, the design is well suited to the demanding braking environment of the 991 GT3 Cup.

Slotted Friction Surface

The slotted friction surface is designed for high-performance and competition brake pads.

Slots help maintain a consistent interface between the brake pad and rotor surface during repeated high-temperature use without the additional stress concentrations associated with drilled rotor designs.

Serviceable Two-Piece Design

One of the biggest advantages of the GiroDisc system is that you do not need to purchase complete rotor assemblies every time the friction rings reach their service limit.

Once you own the GiroDisc assemblies, the aluminum hats can be reused as long as they remain serviceable.

Simply replace the worn cast-iron friction rings and mounting hardware.

Demon Speed offers the GiroDisc D1-238 replacement front rotor rings separately, substantially reducing the cost of future rotor replacement.

Complete Front Rotor Pair

This product includes the complete GiroDisc front rotor assemblies:

• Left front rotor
• Right front rotor
• GiroDisc aluminum center hats
• Cast-iron slotted friction rings
• Floating rotor hardware

Sold and priced as a pair.

If your car already has GiroDisc A1-238 rotor assemblies and you only need new friction rings, order the D1-238 replacement front rotor rings instead.

Specifications

Application: Porsche 991 GT3 Cup
Axle: Front
Rotor Diameter: 380mm
Rotor Thickness: 32mm
Construction: Two-piece floating
Rotor Ring: GiroDisc cast iron
Center Hat: 6061-T6 aluminum
Surface: Slotted
GiroDisc Part Number: A1-238
Replacement Ring: D1-238
Quantity: Pair

Features

• Direct replacement for Porsche 991 GT3 Cup front brake rotors
• 380mm × 32mm
• Two-piece floating rotor construction
• GiroDisc cast-iron friction rings
• 6061-T6 aluminum center hats
• Curved-vane internal cooling
• Slotted friction surface
• Designed for demanding track and competition use
• Works with OE GT3 Cup brake calipers
• No modification required
• Replaceable friction rings
• D1-238 replacement rings available separately
• Sold as a left and right front pair
• GiroDisc Part Number A1-238