GiroDisc GiroDisc 2018+ Subaru WRX STI (Requires Trimmed Rear Pads) Slotted Rear Rotors
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GiroDisc 2018+ Subaru WRX STI (Requires Trimmed Rear Pads) Slotted Rear Rotors

GiroDisc
GIRA2-185
A2-185
Brake Rotors - 2 Piece
5 Units In Stock - Ships Next Business Day
$ 995.00
$ 995.00

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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