BMW G8X Iron Conversion Rear Replacement Rings
Renew your braking performance with the Girodisc D2-322 Rear Replacement Rings, designed specifically for the Girodisc A2-322 Iron Conversion rotor system on the BMW G8X platform. Whether your M3 or M4 originally came with carbon ceramics or standard iron rotors, these rings let you restore peak performance without replacing your entire rotor assembly.
Each set is precision-machined from Girodisc’s proprietary U.S.-poured high-carbon cast iron, delivering the same championship-level performance and cooling efficiency as your original Girodisc rotors. Built to withstand extreme heat cycles and track abuse, the D2-322 replacement rings bring your braking system back to life with fresh hardware and exact OEM fitment.
Features and Benefits
- Direct replacement rings for Girodisc Iron Conversion Rear Rotors (A2-322)
- Includes all new attachment hardware – pins, bolts, and washers
- Machined from proprietary high-carbon cast iron for superior heat capacity and durability
- 48 curved directional vanes maximize airflow for efficient cooling
- Lightweight two-piece rotor design reduces unsprung and rotational mass
- Fully machined, balanced, and assembled in the USA
Vehicle Fitment
- BMW G80 M3 (2021+)
- BMW G82 M4 (2021+)
- BMW G83 M4 Convertible (2021+)
These replacement rings are designed exclusively for Girodisc Iron Conversion kits (part number A2-322) and will not fit OEM or other aftermarket rotor hats, including factory two-piece assemblies.
Why Choose Girodisc
Girodisc has earned its reputation as the leader in performance braking systems, offering precision-engineered components built for the demands of modern sports cars. Each rotor ring is designed to provide consistent braking, optimized cooling, and maximum longevity. The D2-322 replacement set lets you keep your original Girodisc hats while restoring the braking response and confidence you expect from your G8X M car.
FAQs
Do these include the aluminum hats?
No. The D2-322 kit includes only the iron rotor rings and new hardware. You will reuse your existing Girodisc hats from the A2-322 Iron Conversion kit.
Are these compatible with OEM BMW carbon ceramic or two-piece rotors?
No. These are only compatible with Girodisc Iron Conversion rotor hats (A2-322) and cannot be used with OEM or other aftermarket assemblies.
Are they directional?
Yes. Each rotor ring has curved internal vanes designed for optimal airflow and cooling when installed on the correct side.
What’s included in the box?
A pair of rear replacement rings (left and right) and a complete hardware kit with new drive pins, bolts, and washers.
Ready to Upgrade?
If your Girodisc iron conversion rotors have reached their wear limit, the D2-322 Rear Replacement Rings will bring your BMW M3 or M4 braking system back to its peak. Experience the legendary cooling and stopping performance that make Girodisc the go-to choice for track and street enthusiasts alike. Order your set today from Competition Motorsport and get back to maximum braking confidence.
