SKU: A2-185
GiroDisc 2018+ Subaru WRX STI (Requires Trimmed Rear Pads) Slotted Rear Rotors
GiroDisc slotted rear rotors deliver direct replacement braking upgrades for 2018-2021 Subaru WRX STI models. These two-piece rotors feature lightweight aluminum hats and high-performance slotted friction rings for reduced unsprung weight and consistent stopping power under demanding conditions. Drivers experience improved heat dissipation and pad life on track or street.
Key Features
- Two-Piece Construction: 6061-T6 aircraft-grade aluminum hats reduce rotor weight by 2.2 kg (4.85 lbs) per side compared to OEM steel rotors for sharper handling and less rotational mass
- Slotted Friction Ring: Narrow slots clear brake gases dust and water while providing progressive bite and even pad wear during aggressive driving
- Curved Vane Design: 72 directionally curved internal vanes pull cooling air through the rotor core to maintain temperatures and prevent fade in repeated hard stops
- Secure Floating Attachment: TiN-coated Inconel bimetallic bobbins with stainless steel hardware ensure friction ring stays centered without loosening over time
- Precision Specifications: 326 mm outer diameter 18 mm thickness and 65.5 mm height match OEM dimensions for bolt-on installation with no modifications to calipers or hubs
Product Notes
- Requires trimming of OEM rear brake pads to clear the aluminum hat profile
- Follow GiroDisc 500-600 mile break-in procedure with light braking to bed in slots and achieve full performance
- Ships as a pair in protective packaging to prevent damage during transit
Installation Notes
- Professional installation recommended.
- Trim rear pads using provided instructions or GiroDisc pad trim service before assembly
- Includes all necessary stainless steel hardware. torque to factory specs and reuse OEM hub-centric rings
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2018-2021 | Subaru | WRX STI | All |
| 2018-2021 | Subaru | WRX STI | Type RA |
Why Choose GiroDisc?
- Motorsport-proven in SCCA NASA and endurance racing with thousands of race wins
- Hand-assembled in the USA with aerospace-grade materials for durability and repeatability
- Engineered for street and track use with focus on weight reduction and thermal management
Frequently Asked Questions
-
Q: Will these rotors fit my 2018-2021 Subaru WRX STI with stock calipers?
A: Yes they are a direct bolt-on replacement for all 2018-2021 WRX STI models including Type RA with no caliper or suspension changes required -
Q: What material is used for the rotor ring and hats?
A: High-strength alloy steel friction ring with heat-treated slotted surface paired with silver-anodized 6061-T6 aluminum hats for corrosion resistance and light weight -
Q: What is the warranty and bedding process?
A: Lifetime warranty on hats against cracking. 3-year on rings. Bed in with 500-600 easy miles avoiding hard stops then perform heat cycles for optimal performance
Shipping & Handling
- Method: Ground shipping via UPS or FedEx
- Availability: In stock - ships same or next business day
- Packaging: Secure foam-wrapped pair in heavy-duty box measuring 14 x 14 x 5 inches
- Weight: 20.5 lbs
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