Specialized Aethos Lightweight Headset Top Cap & Bolt OEM

Specialized Aethos Lightweight Alloy Compression Top Cap & Bolt

Factory OEM | 1-1/8" | 30.6mm OD | S202500013

The Specialized Factory Replacement Lightweight Alloy Compression Top Cap & Bolt Assembly is the genuine OEM headset top cap used on select Specialized Aethos and S-Works Aethos models.

Designed for a 1-1/8" steerer, the lightweight alloy top cap measures 30.6mm OD and includes the correct M6 × 1.0 × 30mm bolt for proper headset preload and a clean factory appearance.

Ideal for replacing a lost, damaged, or worn original top cap while maintaining the lightweight OEM configuration of your Aethos.

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

Key Features

• Genuine Specialized factory replacement part
• OEM top cap for Specialized Aethos applications
• Lightweight alloy construction
• Designed for 1-1/8" steerer systems
• 30.6mm outside diameter
• Includes M6 × 1.0 × 30mm bolt
• Provides proper headset preload
• Maintains the original Specialized fit and appearance
• Direct replacement for compatible Aethos models

Specifications

OEM Compatibility

This top cap and bolt assembly was used as original equipment on select 2021–2025 Specialized Aethos and S-Works Aethos models.

2025

• S-Works Aethos Frameset – FACT 12r Carbon
• S-Works Aethos Warranty Frame
• S-Works Aethos – Shimano Dura-Ace Di2
• S-Works Aethos – SRAM RED AXS
• Aethos Sport – Shimano 105
• Aethos Pro Warranty Frame
• Aethos Pro – Shimano Ultegra Di2
• Aethos Pro – SRAM Force eTap AXS
• Aethos Frameset – FACT 10r Carbon
• Aethos Expert – SRAM Rival eTap AXS
• Aethos Comp – Shimano 105 Di2

2024

• S-Works Aethos Ready to Paint Frameset
• S-Works Aethos LTD – SRAM RED AXS
• S-Works Aethos Frameset – FACT 12r Carbon
• S-Works Aethos Warranty Frame
• S-Works Aethos – Shimano Dura-Ace Di2
• S-Works Aethos – SRAM RED eTap AXS
• Aethos Sport – Shimano 105
• Aethos Pro Warranty Frame
• Aethos Pro – Shimano Ultegra Di2
• Aethos Pro – SRAM Force eTap AXS
• Aethos Frameset
• Aethos Expert – SRAM Rival eTap AXS
• Aethos Comp – Shimano 105 Di2

2023

• S-Works Aethos LTD – Campagnolo Super Record
• S-Works Aethos Frameset – Ready to Paint
• S-Works Aethos Frameset – FACT 12r Carbon
• S-Works Aethos – Shimano Dura-Ace Di2
• S-Works Aethos – SRAM RED eTap AXS
• Aethos Pro – Shimano Ultegra Di2
• Aethos Frameset – FACT 10r Carbon
• Aethos Expert – SRAM Rival eTap AXS
• Aethos Expert
• Aethos Comp – Shimano 105 Di2

2022

• S-Works Aethos Frameset – Sagan Collection: Disruption
• S-Works Aethos Frameset – Ready to Paint
• S-Works Aethos Frameset – FACT 12r Carbon
• S-Works Aethos – Shimano Dura-Ace Di2
• S-Works Aethos – SRAM RED eTap AXS
• Aethos Pro – SRAM Force eTap AXS
• Aethos Frameset – Sagan Collection: Disruption
• Aethos Frameset
• Aethos Expert – Shimano Ultegra Di2
• Aethos Comp – SRAM Rival eTap AXS

2021

• S-Works Aethos Frameset
• S-Works Aethos – SRAM RED eTap AXS
• S-Works Aethos – Founder's Edition
• S-Works Aethos – Dura-Ace Di2
• Aethos Pro – Shimano Ultegra Di2
• Aethos Pro – SRAM Force eTap AXS
• Aethos Frameset
• Aethos Expert

Compatibility Notes

• Factory OEM fitment covers select 2021–2025 Aethos and S-Works Aethos models listed above.
• Designed for a 1-1/8" steerer.
• Verify the original top cap dimensions and Specialized part number before ordering.
• This listing is for the top cap and bolt assembly.

Why Choose Genuine Specialized Replacement Parts?

A headset top cap is a small component with an important job: providing the preload necessary for proper headset adjustment. Using the genuine Specialized assembly ensures the correct dimensions, bolt specification, lightweight construction, and factory appearance intended for the Aethos.

For an Aethos restoration, replacement, or service, S202500013 provides a direct OEM solution without substituting a generic headset component.