GiroDisc D2-318 Rear Replacement Rotor Rings Cadillac CT4-V Blackwing 340mm 2022

Vehicle Fitment

• 2022+ Cadillac CT4-V Blackwing - Rear axle (replacement rings for GiroDisc A2-318 rear rotor kit)

Fitment Notes

• Replacement rings only - these are cast iron rotor rings sold without hats; the existing GiroDisc aluminum hats from the A2-318 kit are reused with new rings and fresh hardware
• Compatible with GiroDisc A2-318 hats ONLY - these rings are not designed to work with OEM Cadillac/Brembo hats, any other brand's hats, or factory 2-piece rotor hats; attempting to use them with non-GiroDisc hats will result in incorrect fitment
• Sold as a pair (2 rings - one complete rear axle set); all required replacement hardware is included
• For the front axle replacement rings (A1-318 front kit), see GiroDisc D1-066 (380x34mm, 72 curved vanes)
• Rotor ring installation should be performed by a qualified brake technician; GiroDisc provides full re-assembly instructions with each ring set

Features

• Restores A2-318 rear rotor assemblies to new performance - worn or cracked rings are the only consumable component of the GiroDisc 2-piece system; replacing them with D2-318 rings returns full braking performance and thermal capacity while retaining the existing aluminum hat and floating hardware
• Proprietary GiroDisc high-carbon iron - rings are machined from GiroDisc's proprietary cast iron alloy, poured and machined entirely in the USA from domestically sourced materials; the same specification used by professional racing organisations
• 48 curved internal vanes - the replacement rings share the same vane geometry as the original A2-318 rings, acting as a centrifugal pump to draw cooling air in through the hub and drive it outward through the disc during rotation for effective thermal management under the hard rear braking loads the CT4-V Blackwing's track-focused chassis generates
• Slotted rotor surface - precision-cut slots continuously sweep brake dust, gases, and debris from the pad contact face to maintain consistent bite and resist glazing during sustained or repeated hard braking
• Spring clips and Belleville washers - race-ready floating hardware provides axial and radial float under braking loads while eliminating cold-temperature rattle; street-friendly from day one
• All replacement mounting hardware included - new drive pins, spring clips, Belleville washers, and fasteners are supplied; re-use of old hardware is not required or recommended
• Significant cost saving versus full assembly replacement - purchasing D2-318 rings and reusing existing A2-318 aluminum hats costs substantially less than replacing complete rear rotor assemblies
• Manufactured in the USA from domestically sourced materials (GiroDisc, Bellingham, WA)

Specifications

• Part Number: D2-318
• Product: Rear Replacement Rotor Ring Set
• Quantity: 2 rings (1 pair - rear axle set) + complete hardware kit
• Rotor Outer Diameter: 340 mm
• Internal Vane Count: 48 curved vanes
• Rotor Style: Slotted
• Ring Material: Proprietary GiroDisc cast iron (poured and machined in USA)
• Compatible Assembly: GiroDisc A2-318 (Cadillac CT4-V Blackwing 2022+ Rear Rotors)
• Hat Included: No - reuse existing GiroDisc A2-318 aluminum hats
• Hardware Included: Yes - spring clips, Belleville washers, drive pins, and fasteners for both rings
• Front Axle Rings: D1-066 (380x34mm, 72 vanes - for A1-318 front kit)
• Country of Manufacture: USA (Bellingham, WA)

Included Components

• 2x GiroDisc proprietary cast iron rear replacement rotor rings (340 mm, slotted, 48 curved vanes)
• 2x Complete hardware kits (spring clips, Belleville washers, drive pins, fasteners - one kit per ring)
• Re-assembly instructions

Product Description

The GiroDisc D2-318 is a pair of 340 mm rear replacement rotor rings for the GiroDisc A2-318 two-piece rear rotor kit fitted to the 2022+ Cadillac CT4-V Blackwing. The A2-318 is a direct OE-diameter replacement for the Blackwing's factory Brembo four-piston rear brake system, and the GiroDisc two-piece construction is designed from the outset for long-term serviceability: the black anodized 6061-T6 aluminum hat and spring clip/Belleville washer floating hardware are fully reusable across multiple ring service cycles, while only the cast iron rings need replacement when worn or cracked. Purchasing D2-318 rings and reusing the existing A2-318 hats substantially reduces the per-service cost compared to replacing complete rear assemblies - a meaningful advantage for Blackwing owners who use their cars regularly at track events.

The replacement rings are machined from GiroDisc's proprietary high-carbon iron casting, produced entirely in-house at their Bellingham, WA facility from domestically sourced materials, and carry the same 48 curved internal vane geometry as the original A2-318 rings. This vane architecture functions as a centrifugal pump during rotation, pulling cooling air in through the hub and driving it outward through the rear disc face for effective thermal management under the sustained rear braking loads the CT4-V Blackwing's track-capable chassis demands. The slotted ring face sweeps the pad contact zone clear of debris and gases throughout the ring's service life. Each D2-318 set includes all required replacement hardware - spring clips, Belleville washers, drive pins, and fasteners - with full re-assembly instructions. Old hardware should not be reused.

These rings are designed exclusively for GiroDisc A2-318 hats and are not compatible with the OEM Cadillac/Brembo two-piece rotor hats or any other brand's hardware. The front axle replacement rings for the A1-318 front rotor kit are GiroDisc D1-066 (380x34mm, 72 curved vanes). All D2-318 components are manufactured at GiroDisc's facility in Bellingham, WA.