McLaren 380mm Front Rotors, incl. spacers

Unlock consistent, repeatable stopping power with Girodisc two-piece floating front rotors for McLaren models originally equipped with 370mm cast-iron front discs. This upgrade increases diameter to 380mm and includes the required caliper spacers for a true bolt-on installation. You keep factory brake bias and ABS while gaining cooling capacity, lighter rotating mass, and sharper pedal feel.

Race-Bred, Street-Refined

Each rotor pairs a U.S.-sourced 6061-T6 aluminum hat with Girodisc’s proprietary high-carbon cast-iron ring. Curved internal vanes act like a centrifugal pump to move cooling air through the disc under hard use. The fully floating mount system controls thermal growth, helping the rotor self-center between pads and maintain quiet street manners via anti-noise spring/Belleville washers.

Features

• Diameter upgrade: 370mm → 380mm for more torque leverage and thermal headroom
• Direct fit: Includes caliper spacers; uses factory calipers and pad shape
• Two-piece floating design: Reduces unsprung/rotational mass and improves consistency
• Curved directional vanes: Efficient internal airflow for superior heat management
• Serviceable: Replace rings later and reuse the hats to lower long-term cost
• Premium hardware: 12 cadmium-plated alloy steel drive pins with class 12.9 cap screws and hardened washers
• Made in the USA: Hats and rings machined in-house for precise fit

Vehicle Fitment

For McLaren applications originally equipped with 370mm cast-iron front rotors (non-CCM). Examples include:

• McLaren MP4-12C (iron brake package)
• McLaren 650S (iron brake package)
• Other McLaren models using 370mm iron front rotors

Note: Not for factory carbon-ceramic (CCM) brake packages. If you’re unsure, send your VIN and a brake photo—we’ll verify fitment before you order.

What’s Included

• (2) Pre-assembled 380mm two-piece floating front rotors (left/right)
• (2) Caliper spacers sized for 380mm conversion
• Mounting/torque guidance and bedding procedure

Girodisc A1-023 Technical Specifications

• Part Number: A1-023
• Position: Front
• Rotor Diameter: 380mm (upgrade from 370mm)
• Construction: Two-piece, fully floating
• Hat Material: 6061-T6 aluminum (anodized)
• Ring Material: High-carbon cast iron
• Vanes: Curved, directional
• Hardware: 12 drive pins, class 12.9 fasteners, spring/Belleville washers
• Sold/Price: Per pair

Installation & Bedding

• Clean hub faces thoroughly; remove rust and debris.
• Install rotors and supplied caliper spacers; torque fasteners to spec.
• Bed pads: several medium stops 60→10 mph, then a few hard stops 80→20 mph. Drive to cool with minimal braking.

Girodisc A1-023 FAQs

Do I need different pads? No—these retain the factory caliper and pad shape. Choose a compound appropriate for street or track.

Will they rattle? The floating hardware uses anti-noise spring/Belleville washers to maintain quiet operation while allowing thermal float.

Are replacement rings available? Yes. When the rings reach minimum thickness or crack to an edge, replace the rings and reuse the hats/hardware.

Street and track use? Absolutely. Pair with quality pads and high-temp fluid for track days; they’re refined enough for daily use.

Step up to Girodisc 380mm rotors for cooler temps, stronger bite, and repeatable braking—without changing your calipers.