Girodisc Subaru WRX STI (2004–2017) Front Rotors

The Girodisc system is a direct replacement for the OEM front rotors on the 2004–2017 Subaru WRX STI. Weighing only 16.6 lbs per rotor, these lightweight 2-piece assemblies dramatically reduce unsprung and rotational mass, improving steering response, acceleration, and suspension control. Designed for both high-performance street use and demanding track conditions, the Girodisc system maintains factory brake bias and ABS functionality while delivering improved cooling and endurance.

Precision Engineering

The rotor rings are machined from Girodisc’s proprietary high-carbon iron alloy, poured and processed entirely in-house in Bellingham, Washington. This advanced metallurgy ensures superior thermal stability and wear resistance under extreme braking conditions. The 30 curved vanes act as centrifugal pumps, drawing air through the hub to enhance rotor cooling during high-load track sessions.

Features

• Direct bolt-on replacement for OEM front rotors – no modifications required
• Lightweight two-piece floating design reduces unsprung weight
• Proprietary high-carbon iron rings ensure consistent performance and long life
• 6061-T6 aluminum hat, hard anodized for durability
• Floating hardware with spring clips and Belleville washers for quiet operation
• Curved vane internal design maximizes air flow and cooling
• Fully rebuildable – replace iron rings while reusing the hats and hardware
• Manufactured entirely in the USA using domestically sourced materials

Vehicle Fitment

• Subaru WRX STI (2004–2017)

Technical Specifications

• Part Number: A1-007
• Position: Front
• Diameter: 326mm
• Thickness: 30mm
• Weight: 16.6 lbs per rotor
• Rotor Type: Two-piece floating
• Hat Material: 6061-T6 aluminum (black anodized)
• Disc Material: Proprietary high-carbon cast iron
• Vane Design: 30 curved directional vanes
• Drive Pins: High-strength steel alloy, cadmium-plated
• Sold/Price: Per pair

FAQs for Girodisc A1-007

Are these a direct fit for my Subaru WRX STI? Yes. They bolt directly onto all 2004–2017 Subaru WRX STI models with factory calipers and require no additional hardware.

Can I reuse the aluminum hats? Yes. The Girodisc system is fully rebuildable—only the iron rotor rings need to be replaced when worn.

Will they make noise on the street? No. The included Belleville washers and spring clips eliminate the rattles commonly associated with floating rotors.

Are these suitable for track days? Absolutely. Girodisc rotors are engineered for heavy braking, offering superior heat resistance, minimal fade, and consistent performance on the track.

Upgrade your Subaru WRX STI with Girodisc’s precision-engineered floating front rotors—built to deliver race-proven performance, reduced weight, and uncompromising stopping power.