Girodisc D2-185 Subaru WRX STI (’18+) Rear Replacement Rotor Rings
The Girodisc D2-185 Rear Replacement Rotor Rings are precision-engineered replacements for Girodisc two-piece rear rotors on the 2018 and newer Subaru WRX STI. Designed to restore braking performance and durability, these iron rings provide the same cooling efficiency and lightweight characteristics as your original Girodisc setup—perfect for both spirited street driving and track use.
Vehicle Fitment
Compatible with all 2018+ Subaru WRX STI models, these rings are a direct-fit solution for Girodisc two-piece rear rotor systems and are not compatible with OEM or non-Girodisc hats.
Direct Replacement for 2018+ WRX STI Rear Rotors
Each Girodisc D2-185 replacement ring is cast and machined in the USA using Girodisc’s proprietary iron alloy for outstanding thermal capacity and strength. The curved vane internal design acts as a centrifugal air pump, pulling air through the rotor to lower operating temperatures and reduce brake fade. Sold as a pair, these rings come with a full hardware kit and mount directly to your existing Girodisc aluminum hats for a hassle-free installation.
Features
• Size: 316mm x 20mm
• Direct replacement rings for Girodisc Subaru WRX STI (’18+) rear rotors
• Proprietary cast iron alloy poured and machined in the USA
• Curved vane internal geometry for superior cooling and fade resistance
• Includes complete hardware kit (drive pins, washers, and bolts)
• Reuses Girodisc aluminum hats
• Maintains OEM brake bias and ABS function
• Sold/priced per pair
• Not compatible with OEM or other aftermarket hats
Girodisc Subaru WRX STI (’18+) Rear Replacement Rotor Rings FAQs
Can I reuse my Girodisc aluminum hats? Yes. These replacement rings are designed to bolt directly to your Girodisc hats using the included hardware kit.
Are these compatible with OEM or factory rotors? No. Girodisc rings are engineered specifically for Girodisc systems and will not fit OEM or other aftermarket hats.
What’s included in the kit? Two iron rotor rings (left and right) and all necessary hardware for assembly.
Are the rotors directional? Yes. Each ring features directional curved vanes for optimal airflow—make sure to install the correct left and right rotors.
Do these improve performance over OEM rotors? Yes. Girodisc rotors offer better heat dissipation, improved consistency, and longer service life, especially under repeated heavy braking.
Are they sold as a pair? Yes. The Girodisc D2-185 Subaru WRX STI (’18+) Rear Replacement Rotor Rings are sold and priced per pair and include all hardware for installation.
Restore the precision braking feel of your WRX STI with Girodisc D2-185 Rear Replacement Rotor Rings—crafted in the USA for superior cooling, durability, and performance lap after lap.
