GiroDisc Front 2 Piece Floating Rotors

Fitment: 2018-2021 Subaru STI

Part #: A1-185

Overview

The Girodisc Front 2-Piece Floating Rotors are high-performance replacement brake rotors designed specifically for the 2018-2021 Subaru WRX STI. Crafted to deliver improved braking response and reduced unsprung weight, these rotors are ideal for enthusiasts seeking enhanced handling and durability without the need for a complete brake upgrade. Constructed with lightweight materials, they help maintain factory brake bias and ABS efficiency, ensuring reliable and consistent braking performance during spirited driving or track days. The direct bolt-on design guarantees a straightforward installation, making them a practical upgrade for your vehicle’s braking system.

Key Features

Designed with precision engineering, the Girodisc rotors feature a two-piece construction that separates the rotor hat from the braking surface, allowing for thermal expansion and reducing stress during high-heat conditions. The floating design ensures optimal pad contact and even wear, contributing to longer rotor life and more consistent braking feel. Made from high-quality, lightweight materials, these rotors significantly reduce unsprung mass—approximately 16.5 lbs compared to the stock 20.5 lbs—resulting in improved handling and responsiveness. The high-performance design maintains factory brake bias and works seamlessly with OE calipers, providing a reliable upgrade without modifications.

Construction & Design

The Girodisc rotors are engineered with a two-piece floating design that enhances heat dissipation and reduces stress during heavy braking. The rotor hat is typically made from durable aluminum, while the braking surface is crafted from high-quality cast iron, ensuring strength and longevity. The floating system allows for thermal expansion, minimizing warping and cracking under demanding conditions.

Installation & Fitment

These rotors are designed as direct replacements for the OEM units, requiring no modifications or additional hardware. Installation involves simply unbolting the stock rotors and replacing them with the Girodisc units, making it a straightforward upgrade for qualified technicians or experienced enthusiasts.

What’s Included

The package includes two front floating rotors, fully assembled and ready for installation. Hardware necessary for mounting is typically included, but it is recommended to verify fitment and compatibility with your vehicle’s specific setup.

Ideal For

Perfect for Subaru STI owners looking to improve braking performance, reduce unsprung weight, and enhance handling characteristics without upgrading to a larger brake kit. Suitable for daily driving, spirited street use, and track days where consistent braking response is essential.