Skip to product information
1 of 3

AProto Bike

Low Stack Internal Cable Routing Headset Adapter for Trek Emonda ALR / Trek Domane (MKIV)

Low Stack Internal Cable Routing Headset Adapter for Trek Emonda ALR / Trek Domane (MKIV)

Regular price $32.99 USD
Regular price Sale price $32.99 USD
Sale Sold out
Shipping calculated at checkout.
Bike Model
Custom Stem Adapter

Why do you want it?

You seeking a lower-stack solution (~8mm-9mm) that cleans up the cable routing on your Trek Emonda ALR or Trek Domane (Gen IV) SL, SLR, RSL or ALR while using the parts referenced in the Trek Service Manuals.

You want to use a FSA / Vision, Specialized Tarmac SL7, Kalloy Uno, Enve In-Route or other stem on your Trek while keeping the cables neatly tucked away.

What is it?

This part allows you to use FSA ACR split spacers or transition spacers for the FSA ACR system with the above Trek bikes.

In order to work, this part requires the Trek Domane MKIV Headset Split Ring (Part # W5274269). That split ring is listed as the service part for the Emonda ALR in the current service manual, but is not included with that bike and must be purchased separately from your Trek dealer or via this link:

To make this system compatible with stems I also offer the following

If you wish to purchase my version of these FSA ACR or SMR internal routing adapters that pass hose nuts and hydraulic couplers, those products are listed here:

Low Stack hose tray kits for partially external use with the FSA / Vision SMR stems are available here: and

Adapters for the Kalloy Uno stems are available here:

Adapter kits for the Specialized Tarmac SL7 / SL8 stem are available here:

Adapter kits for Enve In-Route stems are available here: Coming Soon!

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.

Customer Reviews

Be the first to write a review
View full details