These GiroDisc 2-piece rotors are replacement for the Toyota GR Corolla and GR Yaris. The GiroDisc rotors are larger than the factory discs, and we include the necessary caliper spacers and longer caliper bolts to reposition the caliper. No other modifications are necessary. Weighing in at 10.4 lbs per rotor, these fully floating assemblies help shed unsprung weight and rotating mass from the rear axle of the vehicle.
The rotor rings are machined from a proprietary casting made of high-carbon iron formulated to GiroDisc’s specifications. This superior metallurgy results in a rotor that lasts longer, and the 48 curved vanes act as a centrifugal pump pulling air in through the hub to effectively cool the rotors under hard use. The 2-piece design means a reusable hat which can be attached to new rings (part number D2-268) when they need to be replaced.
All major components including the hats, rotor rings, and drive pins are manufactured in-house at our facility in Bellingham, WA from domestically sourced materials. The hat is made from 6061-T6 aluminum and coated in a black anodize finish. The drive pins are made from a high-strength steel alloy and cadmium-plated for corrosion resistance. All rotors are assembled with spring clips and Belleville washers for race-ready float while also being street-friendly with no noise from loose hardware.
Diameter:Â 316mm
Thickness:Â 18mm
Weight:Â 10.4 lbs per rotor assembly
The minimum thickness at which we recommend replacing these rings is 16mm. We also recommend replacing them if a crack leads to the edge of the ring.
Track Day / HPDE Evaluation - Girodisc 2-Piece Slotted Rotors
Technical take (what matters on track):
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Floating iron ring + aluminum hat → manages thermal expansion, reduces coning/stress, improves pedal consistency under repeated heat cycles.
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Directional curved vanes → better airflow vs many OE rotors; more stable temps over long sessions.
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Replaceable rings → lower long-term cost if you actually consume rotors.
Who Benefits Most?
Street Builds
Street / Track Hybrid (Best ROI)
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3–10 HPDE days/year, 200tw tires, heavier chassis.
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Solves heat-related pulsation, improves consistency, avoids jumping to a full BBK.
→ Sweet spot customer.
HPDE / Motorsport Builds
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Advanced pace, high brake energy tracks, long sessions.
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Gains: repeatable pedal feel, better thermal stability, serviceable rings.
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Pair with real track pads + ducting.
→ Strong choice short of full race rotor ecosystems.
Bottom Line
Girodisc isn’t about more “stopping power.†It’s about thermal control, consistency, and serviceability. If you’re not heat-limited, you won’t fully exploit them. If you are, they make immediate sense.
