Specialized Aethos Integrated Complete Replacement Headset OEM

Specialized Integrated Headset for Aethos

Factory OEM | Lightweight | Complete Assembly | S202500012

The Specialized Factory Replacement Integrated Headset is a genuine OEM replacement designed specifically for compatible Specialized Aethos and S-Works Aethos frames.

This complete headset uses a custom-size lower bearing and includes the upper and lower bearings, carbon transition cover, compression ring, and carbon headset spacers needed to restore the original factory headset configuration.

Available from Stage 21 Bikes, your trusted source for hard-to-find Specialized OEM replacement parts.

Key Features

• Genuine Specialized factory OEM headset

• Designed for Aethos and S-Works Aethos frames

• Complete integrated headset assembly

• Custom-size Aethos lower bearing

• 45° × 45° upper and lower cartridge bearings

• Carbon top transition cover

• Split compression ring

• Five carbon headset spacers included

• Specialized MPN S202500012

Kit Includes

• 1 × Upper Bearing – 41.8mm OD × 30.5mm ID × 8mm

• 1 × Lower Bearing – 49.5mm OD × 40.5mm ID × 6.5mm

• 1 × Carbon Top Transition Cover – 45mm OD × 9.5mm tall

• 1 × Split Plastic Compression Ring – 7mm tall

• 3 × Carbon Headset Spacers – 10mm

• 2 × Carbon Headset Spacers – 5mm

Specifications

OEM Compatibility

Compatible with select 2021–2025 Specialized Aethos and S-Works Aethos models, including:

• Aethos Sport

• Aethos Comp

• Aethos Expert

• Aethos Pro

• Aethos Frameset

• S-Works Aethos

• S-Works Aethos Frameset

• S-Works Aethos Ready to Paint Frameset

• S-Works Aethos LTD

• Sagan Collection and Founder's Edition models

OEM applications include Shimano 105, 105 Di2, Ultegra Di2, Dura-Ace Di2, SRAM Rival AXS, Force AXS, RED AXS, and select Campagnolo builds.

Compatibility Notes

• For compatible 2021–2025 Aethos and S-Works Aethos frames.

• Uses the Aethos-specific custom lower bearing size.

• Includes bearings, carbon transition cover, compression ring, and spacers.

• Compression plug, top cap bolt, stem, and other cockpit parts are not included.

• Verify Specialized MPN S202500012 before ordering.

The Specialized Aethos Integrated Headset S202500012 provides the factory-correct replacement assembly for restoring the original headset fit and function.

Stage 21 Bikes carries genuine Specialized factory replacement parts and hard-to-find Aethos headset, cockpit, and frame service components.