Porsche 408x36mm Front Replacement Rings
Bring your Porsche’s braking system back to peak performance with the Girodisc D1-291 Front Replacement Rings. Designed for applications using 408x36mm Girodisc two-piece rotors, these rings deliver the same unmatched stopping power, thermal stability, and lightweight construction as your original setup—without the cost of new hats.
Each ring is CNC-machined from Girodisc’s proprietary U.S.-poured high-carbon cast iron alloy. The result is exceptional strength, cooling, and longevity for high-performance street and track use. Whether you’re driving your GT4 RS or GT3 RS at full throttle, these replacement rings ensure every lap, corner, and stop feels just as sharp as the first.
Features and Benefits
- Direct replacements for Girodisc 408x36mm two-piece front rotors
- Includes brand-new hardware—reuse your existing Girodisc aluminum hats
- Manufactured from proprietary high-carbon cast iron for maximum heat capacity
- 48 curved directional vanes for superior airflow and cooling efficiency
- Two-piece floating design reduces unsprung mass and improves handling response
- Fully machined, balanced, and assembled in the USA
Vehicle Fitment
- 2022+ Porsche 718 Cayman GT4 RS (982) – with steel brakes
- 2023+ Porsche 911 GT3 RS (992) – with steel brakes
These replacement rings are designed exclusively for Girodisc aluminum hats and will not fit OEM or other aftermarket hat systems. They are not compatible with PCCB carbon-ceramic brakes.
Why Choose Girodisc
Girodisc brake systems are engineered for uncompromising performance. Each rotor ring is precision-machined, balanced, and tested to deliver consistent brake modulation and fade-free stopping power under extreme conditions. When your original rings reach their wear limit, these replacements let you refresh your braking system with OEM-level precision at a lower cost.
FAQs
Do these include the aluminum hats?
No. The D1-291 kit includes only the rotor rings and new hardware. Your existing Girodisc hats are reused.
Can these be used with factory rotors?
No. Girodisc replacement rings are specifically designed for Girodisc two-piece rotors and will not fit OEM or other aftermarket assemblies.
Are they directional?
Yes. Each ring features curved internal vanes for optimized airflow and must be installed on the correct side for proper cooling performance.
What’s included?
Two 408x36mm front rotor rings (left and right) plus a complete hardware kit with new drive pins, bolts, and washers.
Ready to Refresh?
Restore your Porsche’s braking confidence and consistency with Girodisc D1-291 Front Replacement Rings. Engineered for the 718 GT4 RS and 992 GT3 RS, these rings bring factory-level precision with motorsport-grade performance. Order your set today from Competition Motorsport and keep your Porsche braking at its absolute best.
