Toyota GR Supra, BMW 345mm Rear Replacement Rings
Bring your Toyota GR Supra or BMW back to peak braking performance with the Girodisc D2-307 Rear Replacement Rings. These high-performance iron rotor rings are engineered as direct replacements for your Girodisc two-piece rotors, delivering exceptional cooling, reduced weight, and race-proven reliability for street and track use alike.
When your Girodisc rotors reach their wear limit, these precision-machined rings let you refresh your braking system without buying new hats. Each ring is crafted from Girodisc’s proprietary U.S.-poured high-carbon cast iron, designed for extreme heat resistance and consistent braking under load. Whether you’re attacking corners on the track or driving hard on the street, Girodisc ensures your braking stays sharp, stable, and fade-free.
Features and Benefits
- Direct replacements for Girodisc 345mm two-piece rear rotors
- Machined from proprietary high-carbon cast iron for superior durability
- 48 curved directional vanes optimize airflow and heat dissipation
- Lightweight design minimizes unsprung and rotational mass
- Includes all new drive pins, bolts, and washers for installation
- Fully machined, balanced, and assembled in the USA
Vehicle Fitment
- 2020+ Toyota GR Supra (A90 / A91)
- 2019+ BMW Z4 M40i
- BMW G29 Platform (B58 engine)
These rings are designed exclusively for Girodisc aluminum hats and will not fit OEM or other aftermarket rotor hats.
Why Choose Girodisc
Girodisc brake systems are the benchmark for performance and reliability in motorsport-inspired braking. The D2-307 replacement rings allow you to maintain top-tier braking performance at a fraction of the cost of full rotor replacement. Every Girodisc component is precision engineered, race-tested, and built to handle extreme thermal stress with consistent, confident braking lap after lap.
FAQs
Do these include the aluminum hats?
No. The D2-307 kit includes only the iron rotor rings and a new hardware kit. Your existing Girodisc hats are reused.
Can these be used with factory rotors?
No. Girodisc replacement rings are designed exclusively for Girodisc two-piece rotors and will not bolt to OEM or other aftermarket hats.
Are these rotors directional?
Yes. Each rotor ring features curved internal vanes and must be installed on the correct side for optimal airflow and cooling efficiency.
What comes in the box?
A pair of 345mm rear rotor rings (left and right) plus all new drive pins, bolts, and washers.
Ready to Upgrade?
When it’s time to restore the full stopping power of your Toyota GR Supra or BMW Z4, the Girodisc D2-307 Rear Replacement Rings deliver uncompromising quality, cooling performance, and long-term durability. Order your set today from Competition Motorsport and keep your braking performance at its absolute best.
