GiroDisc A1-157 Slotted 2-Piece 360mm Front Rotor Set for BMW E9X M3/1M

Vehicle Fitment

• 2011 BMW 1 Series M Coupe (E82, Front, 3.0L I6, RWD)
• 2008-2013 BMW M3 (E90/E92/E93, Front, 4.0L V8, RWD)

Features

• Direct replacement for OEM rotors with no modifications required
• Two-piece slotted design for improved heat dissipation and performance
• Approximately 6.8 lbs lighter per rotor compared to stock units
• Maintains OEM brake bias and ABS efficiency
• Constructed with U.S.-sourced 6061-T6 aircraft specification aluminum center hats
• Proprietary cast iron rotors machined in-house at GiroDisc
• Curved vane design developed in racing to force cooling air through the disc
• Utilizes high-strength alloy steel drive pins for secure mounting

Specifications

• Front rotor size: 360 mm
• Material: Cast iron rotor with 6061-T6 aluminum hat
• Weight: Approximately 11 lbs per rotor
• Compatibility: OEM calipers, RWD drivetrain
• Rotor style: Slotted
• Rotor treatment: Non-cryo treated
• Rotor coating: Non-coated
• Mounting: Floating rotor system with high-strength alloy steel drive pins

Included Components

• 1x Front Left GiroDisc A1-157 Rotor
• 1x Front Right GiroDisc A1-157 Rotor
• 2x Caliper Spacers
• 2x Sets of Mounting Hardware

Product Description

The GiroDisc A1-157 Slotted 2-Piece Rotor Set is designed as a direct replacement for the OEM front rotors on the BMW E9X M3 and 1M Coupe. These rotors are engineered to bolt directly to the vehicle without any modifications, ensuring compatibility with the factory brake system.

Constructed with a two-piece design, the A1-157 rotors feature a cast iron braking surface paired with a lightweight 6061-T6 aluminum center hat. This configuration reduces unsprung weight by approximately 6.8 lbs per rotor compared to stock units, enhancing acceleration and suspension response. The slotted design improves heat dissipation and reduces brake fade, making them suitable for both street and track use.

Installation is straightforward, utilizing the existing OEM calipers and hardware. The floating rotor system, secured with high-strength alloy steel drive pins, allows for thermal expansion while maintaining rotor alignment. This setup ensures consistent braking performance under demanding conditions.

Please note that these rotors are not compatible with the Carbon Ceramic Matrix (CCM) brake systems. For vehicles equipped with CCM brakes, alternative rotor options are required.