D1-066 Girodisc 380×34 Front Replacement Rings

These D1-066 380×34 mm front replacement rings are sold in pairs and include new hardware. Reuse your existing Girodisc aluminum hats. Rings are engineered exclusively for Girodisc hats and are not compatible with OE or other aftermarket hats.

Vehicle Fitment

• Cadillac CT4-V Blackwing – Front (for A1-318 kits)

Serviceable Two-Piece Design

Proprietary high-carbon iron rings with curved vanes pull air through the disc for stable temperatures under repeated heavy braking. New drive pins, clips, and Belleville washers restore proper float and clamp force.

Features

• Replacement rings only; includes new hardware
• Direct fit for Girodisc A1-318 front rotor kits
• High-carbon iron rings; USA-poured and machined
• Curved vane internal geometry for efficient cooling
• Sold/priced per pair

D1-066 FAQs

When should I replace the rings? Replace at the service thickness specified by Girodisc or if a crack reaches the outer edge of the ring.

Do I need to re-bed pads? Yes — re-bed after ring installation to stabilize the friction layer.

Can I reuse old hardware? No — use the new hardware supplied with the rings and torque per instructions.

Are these drilled or slotted? These are plain rings optimized for strength and heat management; slotting is handled at the complete rotor spec level.

Related Products

• A1-318 Girodisc Cadillac CT4-V Blackwing Front Rotors
• A2-318 Girodisc Cadillac CT4-V Blackwing Rear Rotors
• D2-318 Girodisc Cadillac CT4-V Blackwing Rear Replacement Rings