Girodisc Audi 300mm Rear Replacement Rings
Restore your Audi’s braking precision with Girodisc 300mm rear replacement rings. Designed as direct-fit replacements for existing Girodisc two-piece rotor assemblies, these high-carbon iron rings deliver exceptional heat management, reduced unsprung weight, and smooth, fade-resistant braking performance on the street or track.
Vehicle Fitment
Compatible with:
• Audi B5 S4 (with Stasis or 034Motorsport rear big brake kit)
• Audi B6 S4 (with upgraded rear 300mm Girodisc system)
• Audi B7 S4 (rear 300mm conversion)
Note: These are replacement friction rings only and mount directly to existing Girodisc aluminum hats using the supplied hardware kit.
Precision-Machined Performance
Each Girodisc replacement ring is cast from a proprietary high-carbon iron alloy and machined in the USA for maximum precision and durability. The curved directional vanes inside the rotor act as a centrifugal air pump, pulling cooling air through the disc to dissipate heat efficiently. This design minimizes brake fade, vibration, and cracking — maintaining a consistent pedal feel even under demanding driving conditions.
Features
• Direct replacement for 300mm Girodisc rear rotor assemblies
• Compatible with Audi S4 B5/B6/B7 models using 300mm upgrades
• High-carbon iron alloy resists warping and thermal stress
• Directional vane design for efficient heat dissipation
• Machined, balanced, and finished in the USA
• Includes new floating hardware kit
• Sold/priced per pair
Specifications
• Diameter: 300mm
• Position: Rear
• Material: High-carbon cast iron
• Includes: Two rotor rings and full hardware kit
• Made in the USA
• Sold/priced per pair
Girodisc D2-143 Replacement Ring FAQs
Will these fit my OEM Audi rear rotors? No — these are designed specifically for Girodisc or compatible two-piece rotor assemblies using 300mm hats.
Do they include hardware? Yes, each set includes a full floating hardware kit with new pins, bolts, and washers for secure installation.
Can I reuse my Girodisc hats? Yes, these rings are designed to bolt directly to your existing aluminum hats unless the hats are damaged or worn.
Are these recommended for track use? Absolutely. Girodisc rotors are engineered to handle repeated thermal cycling and heavy braking typical in track and high-performance driving.
Renew your Audi’s braking system with Girodisc D2-143 300mm rear replacement rings — precision-built in the USA for strength, cooling efficiency, and reliable stopping power.
