SKU: D1-185
GiroDisc 2018-2021 Subaru WRX STI Slotted Front Rings
GiroDisc D1-185 slotted front rotor rings deliver track-proven braking for 2018-2021 Subaru WRX STI models. These 356mm x 30mm rings replace stock friction surfaces with slotted patterns that clear gases and debris while curved vanes pull heat away fast. Drivers gain consistent pedal feel shorter stopping distances and less fade during spirited driving or autocross.
Key Features
- Slotted Friction Surface: Narrow slots enhance initial bite clear brake pad residue and expel hot gases for reliable performance lap after lap
- Curved Vane Geometry: Internal vanes direct cooling air through the rotor increasing heat dissipation by up to 20% over OEM straight vane designs
- High-Carbon Cast Iron: Resists cracking warping and corrosion even under extreme heat ensuring long service life
- Lightweight Design: Each ring weighs 15.6 lbs for a pair total of 31.2 lbs shedding 10+ lbs versus stock rotors to sharpen handling response
- Precision Fit: 356mm OD 30mm thickness matches OEM specs for bolt-on installation with GiroDisc aluminum hats
Product Notes
- Requires GiroDisc two-piece rotor hats for assembly sold separately
- Bed-in pads per GiroDisc guidelines for peak performance
- Ships as pair in protective foam-lined box
Installation Notes
- Professional installation recommended.
- Torque hat-to-ring bolts to 20 ft-lbs using blue Loctite
- Compatible with OEM calipers and GiroDisc hats only
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2018-2021 | Subaru | WRX STI | All |
Why Choose GiroDisc?
- Proven in endurance racing like NASA SCCA with thousands of track miles
- Hand-finished in Italy from premium materials for exact tolerances
- Patented retention system secures rings without rivets for easy replacement
Frequently Asked Questions
- Q: Will D1-185 fit 2015-2017 Subaru WRX STI?
A: No. Use D1-184 for 2015-2017 VA STI models. 2018+ has updated hub and caliper specs. - Q: What material are the rings made from?
A: High-carbon ductile cast iron provides strength and heat resistance. Slots are machined after casting for precision. - Q: What is the warranty?
A: 12-month manufacturer warranty against defects. Register product on GiroDisc site for coverage.
Shipping & Handling
- Method: UPS Ground
- Availability: In stock – ships same or next business day
- Packaging: Pair in 18 x 18 x 6 inch box with foam inserts
- Weight: 33 lbs shipping weight
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