A1-291 Girodisc 2pc Front Brake Rotors for Porsche Cayman GT4RS (OEM Steel)
Give your Porsche 718 Cayman GT4RS a serious braking upgrade with the Girodisc A1-291 front rotors. These 2-piece rotors are a direct-fit replacement for the OEM iron rotors and are designed to deliver better heat resistance, reduced unsprung weight, and consistent performance lap after lap.
FITMENT: Porsche Cayman GT4RS (OEM steel rotors), Front
Unlike many aftermarket track rotors, the A1-291 Girodisc rotors are designed to work with the unmodified factory pad shapes and factory Brembo calipers. No adapters, spacers, or changes are required—just bolt them on and go.
The 2-piece construction features lightweight aluminum hats and high-carbon cast iron rings. This design reduces rotational mass and allows the rotor to expand freely under high heat, improving braking response and reducing the risk of cracking under intense use.
These rotors are street-quiet and track-tough, making them ideal for high-performance drivers who want both daily usability and track capability. When the rings wear out, just replace them (D1-291) and reuse the hats to save money over time.
Sold and priced per pair.
Girodisc A1-291 Rotor Features:
Direct-fit upgrade for Porsche GT4RS OEM iron rotors
Compatible with OEM Brembo calipers and pad shapes
2-piece design reduces weight and improves thermal stability
Lightweight 6061-T6 aluminum hats with black anodized finish
Replaceable iron rotor rings (D1-291) reduce long-term cost
Made in the USA using domestic materials
Girodisc A1-291 Rotor FAQs:
Do I need to change pads or calipers? No, these rotors are designed to work perfectly with your factory calipers and pad shape.
Are these rotors good for track use? Absolutely. They offer superior heat dissipation and reduced weight, making them ideal for repeated high-speed stops.
Can I drive with these on the street? Yes, these rotors are engineered to be quiet and smooth enough for daily driving while still delivering track-ready performance.
When should I replace the rings? Replace them when they reach minimum thickness or show signs of cracking. The aluminum hats are reusable with new rings (D1-291).
If you’re serious about driving your GT4RS the way Porsche intended, the Girodisc A1-291 rotor upgrade delivers the stopping power and thermal control to match.
