Mercedes 390mm Front Rotors
The Girodisc 390mm 2-piece floating rotor system is a direct replacement for the factory rotors on select Mercedes-AMG models. No modifications are required—these rotors bolt directly to your OEM calipers, maintaining proper brake bias and full ABS functionality. By upgrading to Girodisc’s lightweight, high-performance rotors, you’ll reduce unsprung weight, improve cooling efficiency, and enhance overall braking response on both street and track.
Each rotor features a precision-machined 6061-T6 aluminum hat paired with Girodisc’s proprietary cast-iron rings. The curved vane design acts as a centrifugal pump, channeling air through the rotor for superior heat dissipation and fade resistance. This combination of materials and design ensures consistent braking performance under demanding conditions while retaining everyday drivability.
Precision-Engineered Performance
Vehicle Fitment
- Mercedes-AMG models equipped with 390mm front rotors
Girodisc A1-123 Features
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Direct OEM fitment: Bolts directly to factory calipers with no adapters or modifications needed.
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Two-piece floating design: Lightweight aluminum hat reduces rotational mass for quicker response and improved handling.
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Curved vane internal cooling: Maximizes airflow through the rotor for exceptional heat management and fade prevention.
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Durable hardware: 12 high-strength alloy steel drive pins allow for controlled thermal expansion without noise or vibration.
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Serviceable construction: Replaceable cast-iron rings make long-term maintenance cost-effective.
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Made in the USA: 100% machined and assembled domestically for precise quality control.
Girodisc A1-123 FAQs
Do these rotors fit directly without modification? Yes—Girodisc rotors are designed as true OEM replacements and bolt on using your existing calipers and hardware.
Are they compatible with factory pads? Absolutely. These rotors are designed to work perfectly with OEM or aftermarket pad compounds.
Will they make noise like some floating rotors? No, Girodisc uses anti-noise spring washers that eliminate rattle while maintaining thermal float.
How do these compare to carbon-ceramic rotors? Girodisc rotors offer better heat absorption and more consistent performance under repeated heavy braking, without the fragility or high replacement cost of CCM systems.
Are they sold as a set? Yes, each order includes a matched pair of front rotors.
Experience the braking precision and performance of Girodisc’s 390mm floating rotors—engineered to deliver race-level stopping power and heat control while maintaining the comfort and reliability expected from Mercedes-AMG vehicles.
