GiroDisc A2-031 325 mm 2-Piece Rear Rotors for 2005-2012 Porsche Boxster

Vehicle Fitment

• 2005-2012 Porsche Boxster S / Boxster (986 & 987)
• 2006-2012 Porsche Cayman S / Cayman (987)

Features

• 2-piece floating rotor design - billet 6061-T6 aluminum hat + proprietary cast-iron disc ring for reduced unsprung and rotational mass
• 325 mm slotted & vented disc - larger than stock for improved braking force and heat dissipation
• Curved-vane internal ventilation - acts like a centrifugal pump to draw cooling air through the rotor under heavy braking
• Floating-mount system using high-strength alloy steel drive pins + hardened hardware with anti-noise spring washers - allows thermal expansion while eliminating cold-start noise/rattle
• Direct bolt-on replacement - includes caliper spacers and hardware for use with OEM calipers - no machining or modification required
• Improved brake cooling and fade resistance - ideal for spirited street driving or occasional track use
• Reduced unsprung mass for better suspension response, improved pedal feel and more consistent braking behavior under load or repeated stops
• Re-buildable rotor design - when discs wear, only the cast-iron rings need replacement; aluminum hats and hardware are reusable

Specifications

• Part Number: A2-031
• Disc Diameter: 325 mm
• Construction: 2-Piece Floating Rotor (Aluminum hat + Cast-iron ring)
• Disc Surface: Slotted & vented with curved internal vanes
• Mounting: Floating-mount with steel drive pins and anti-noise washers
• Sold As: Pair (left + right rear rotors with mounting hardware and caliper spacers)
• Orientation: Rear axle only

Included Components

• 2x Rear brake rotors (left + right), 2-piece slotted & vented 325 mm
• Floating-mount hardware (drive pins, washers, bolts)
• Caliper spacers (to adapt larger rotor diameter with OEM calipers)

Product Description

The GiroDisc A2-031 rear rotor set is a premium performance upgrade for Porsche Boxster (986/987) and Cayman (987) models built between 2005 and 2012. By replacing the original rear rotors with a 325 mm two-piece, floating aluminum-hat + cast-iron rotor design, A2-031 offers stronger braking force, improved heat dissipation, and reduced unsprung/rotational mass - resulting in cooler, more consistent braking and improved suspension responsiveness.

The rotor's slotted and vented surface, combined with a curved-vane internal ventilation system, helps evacuate heat and pad gases efficiently - reducing the risk of brake fade during aggressive driving or repeated stops. The floating-mount hardware ensures proper thermal expansion while maintaining rotor alignment and smooth braking feel, and the caliper spacers included with the kit make it a direct bolt-on fit for OEM calipers. Because the rotor rings are replaceable, you can service the rotors cost-effectively over time without replacing the entire rotor assembly. A2-031 delivers enhanced braking performance and durability - ideal for spirited driving, track days, or anyone seeking an upgrade over the stock rear brakes.