Seller notes

These GiroDisc 2-piece rotors are a direct replacement for the front rotors on the B9 S4, S5, and SQ5. Our 2-piece, fully floating assemblies help shed unsprung weight and rotating mass from the front axle of the vehicle.The rotor rings are machined from a proprietary casting made of high-carbon steel formulated to GiroDisc's specifications. This superior metallurgy results in a rotor that holds up better, and the 72 curved vanes act as a centrifugal pump pulling air in through the hub to effect...

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