Low Stack Internal Cable Routing Headset Adapter for Cervelo Soloist / R5 / Aspero-5 / 2025+ Aspero

Why do you want it?

You are seeking a lower-stack solution (~8mm-9mm) that cleans up the cable routing on your Cervelo road or gravel bike and allows you to use other stems.

You want to use an FSA / Vision, Enve In-Route, Specialized Tarmac SL7, Kalloy Uno, or other stem on your Cervelo while keeping the cables inside. You are comfortable running the C-shaped steerer inside a round stem (e.g., like Jumbo Visma). 

AProto Bike is NOT responsible for any issues or failures that may occur from running this setup. You are responsible for checking for the latest information from Cervelo, and their advice supersedes mine.

This part is only compatible with electronic drivetrains.

What is it?

There are two versions of this Part. The FSA version allows you you to use FSA ACR split spacers or transition spacers for the FSA ACR system with the Cervelo bikes. The Enve version is designed only for use with the Enve In-Route system.

If you are ordering the FSA version you can purchase the following adapters:

• My version of these FSA ACR or FSA SMR internal routing adapters that pass hose nuts and hydraulic couplers, those products are listed here: https://aprotobike.com/products/fsa-ns-acr-or-smr-adapters-transition-spacers
• Low Stack hose tray kits for partially external use with the FSA / Vision SMR stems are available here: https://aprotobike.com/products/smr-stem-low-stack-hose-guide-for-hydraulic-couplers and https://aproto.myshopify.com/products/smr-stem-low-stack-hose-guide
• Adapters for the Kalloy Uno stems are available here:  https://aprotobike.com/products/kalloy-uno-to-fsa-acr-system-internal-routing-adapter-transition-spacer
• Adapter kits for the Specialized Tarmac SL7 / SL8 stem are available here: https://aprotobike.com/products/transition-spacer-adapter-for-specialized-s-works-tarmac-sl7-sl8-stem-to-fsa-acr-system-internal-routing

Please message me to discuss options to fit other stems, custom dimensions, custom integration for stems, etc.

How is it Made?

These parts are printed in the USA on Commercial Grade HP Multi-Jet Fusion machines. Parts, like these, designed to hold preload are made using PA12GB. While this material costs over 2x more than traditional PA12 Nylon, the addition of the glass increases its strength under compression by 80% and in this application, eliminates creep. Given that SLS and MJF printed nylons are only 60%-70% of the density of the high-pressure injection-molded parts made by OEMs, this assures OEM level performance.

This part must be properly installed and the headset preloaded to manufacturer specifications.

Stems, bikes, Headset Split Ring, etc. not included.

Part is guaranteed to fit. If not, you will either be eligible for refund or remakes until this part fits.

If you select a custom stem adapter, please message me with details before ordering.

Note: Items are produced when ordered and have a 4-10 day lead time. Custom orders may take up to 4 weeks depending on the sourcing of parts needed to complete the design.