Girodisc Front Replacement Rings for Porsche 981 / 718

Restore your braking performance without replacing the entire rotor assembly. Girodisc D1-035 front replacement rings are sold in pairs and include all new hardware. Simply bolt them to your existing Girodisc hats to bring your braking system back to peak performance.

D1-135 Vehicle fitment

• Porsche 981 / 718 Cayman & Boxster (front axle) equipped with Girodisc 2-piece rotors.
• Compatible exclusively with Girodisc aluminum hats; not designed for use with OEM or other aftermarket hats, even on factory 2-piece rotor vehicles.

Note: Always verify hat ID, bolt pattern, and rotor outer diameter compatibility before installation.

Precision-engineered replacement solution

Each D1-135 ring is manufactured from high-carbon cast iron and heat-treated for durability. These rings are a direct replacement for worn Girodisc rings, allowing you to keep your lightweight aluminum hats and floating hardware while restoring performance.

D1-135 Features

• Sold as a pair with all replacement mounting hardware
• High-carbon cast iron rotor rings
• Bolt-on fitment to Girodisc hats (no modifications required)
• Balanced and heat-treated for consistent performance
• Compatible with Girodisc floating rotor design using drive pins, washers, and spring clips
• Manufactured in-house in Bellingham, WA from domestically sourced materials
• Designed for longevity and serviceability

Related Products

• Girodisc D2-135 Rear Replacement Rings
• Girodisc A1-135 Front Rotors
• Girodisc A2-135 Rear Rotors

Service guidance

• Replace rings when thickness reaches the minimum specification or if cracks extend to the ring edge.
• Reuse Girodisc hats and install new D1-135 rings with supplied hardware for a cost-effective refresh.

Get your Porsche 981 / 718 back to maximum braking performance with Girodisc D1-135 front replacement rings—an efficient, high-quality service solution designed to keep you on track.