Top Cap Adapter – Road & Gravel Bike Integrated Cockpit Compatibility

Unlock compatibility between your frame's proprietary top cap system and integrated cockpits or stems that were never designed to work together. These precision 3D printed adapters are made for cyclists who want the performance of an integrated cockpit without being locked into a single ecosystem.

What This Solves: 
Integrated cockpits and stems are increasingly frame-specific, making it difficult — or impossible — to mix components across brands. These adapters bridge that gap, letting you run the cockpit you want on the frame you already own.

Currently Available Adapters to ENVE In-Route Integrated Cockpit / Stem: 

• FiftyOne Sika (MY2024–2026)
• Colnago V3Rs (MY2019–2022)
• Colnago C64 (MY2018–2022)
• Colnago V4Rs (MY2023–2025)
• Colnago C68 (MY2022–2026)
• Colnago C68Ti (MY2022–2026)
• Colnago C72 (MY2026-Present)
• Colnago V5rs (MY2026-Present)
• Orbea Orca (MY2023–2026)
• Orbea Orca Aero (MY2022–2026)
• Orbea Terra Race (MY2025–2026)
• FSA ACR/SMR Top Cap

Currently Available Adapters to QuickPro Zephyr SL/SSL & Aelous SSL Integrated Cockpit / Stem: 

• Orbea Orca (MY2023–2026)
• Orbea Orca Aero (MY2022–2026)
• Orbea Terra Race (MY2025–2026)

Currently Available Adapters to Colnago CC1 Integrated Cockpit: 

• Colnago V3Rs (MY2019–2022)
• Colnago C64 (MY2018–2022)

* In Development

Additional Details: 
- For Colnago C64 and V3Rs, due to the D shaped steerer tube, included will be a wedge to fill in the space as well as a top cover. 
- For FiftyOne Sika, adapter is available in a 5mm and 10mm stack height, specify in cart or in a message which you would like. 
- For FSA ACR, adapter will work on any FSA top cap that is compatible with any FSA ACR and SMR one or two piece handlebar/stem combo. 

Optional Extras: 
- For those whom would like additional spacers to run underneath the adapter, dedicated spacers can be included should you not want to run a slammed position with the adapter for an additional $5 USD. Included will be a 5mm, 10mm, and 15mm spacer. 

Frame Not Listed:
If your frame isn't listed above, don't hesitate to reach out. As long as the top cap can be easily found, there's a good chance an adapter can be developed. Send a message with your frame make, model, and model year along with the cockpit or stem you're looking to run and I'll let you know what's possible. For Trek and/or Specialized owners, Trek and Specialized have done a good job creating as many different proprietary top caps for every possible kind of handlebar or stem that the respective manufacturers make. For this reason, if you want to run a different handlebar or stem that is not from Trek or Specialized, please have the part number of the respective top cap or spacer that your bike uses to make it easier to source. 

Color Options: 
All adapters are available in black as standard. White is available per request. If you're looking to match your frame's livery or paint scheme, feel free to reach out with your color request. Custom colors are possible depending on material availability, please reach out about this BEFORE placing your order — filament options do vary, so I'll confirm availability before you purchase. No guarantees on specific colors outside of black and white, but I'm happy to check.

Design Rationale — Why an Adapter Spacer, Not a Replacement Top Cap: 
The decision to design these as spacer adapters rather than full replacement top caps comes down to two things: tolerance risk and convenience.
Bearing preload between the top cap and headset bearings is a tight-tolerance interface. Replicating that as a printed part introduces unnecessary variables I wasn't willing to accept. More practically, it means you don't need to replace your existing stem spacers — your OEM stack stays as-is. The adapter sits as the final spacer in the stack, directly interfacing with the integrated cockpit or stem.

On Stack Height: 
These adapters have been designed to minimize added stack height as much as possible. The limiting factor isn't material thickness or design — it's hydraulic hose routing. Different frames and cockpits exit their hydraulic lines in different locations, and the adapter needs enough internal clearance for the hose to travel without a sharp bend.
A good reference point: ENVE's own V5Rs top cap runs approximately 15mm of stack height even with a fully slammed position for exactly this reason. Most of these adapters come in at around 10mm, and most OEM top caps are around 5-10mm in stack. Adapters where the hydraulic exit points on the frame and cockpit are closely aligned will run even less.

The added stack versus a native top cap will typically be in the 5–10mm range. Given that modern bike fitting trends are increasingly moving toward higher stack and longer reach, this is unlikely to meaningfully affect your position and will probably improve your position — and it certainly won't cost anyone a race.