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The PRO Gap Cap Exp + Di2 BTR Holder is a smart, integrated solution for riders running Shimano Di2 who want a clean and professional cockpit. Designed to replace your standard headset top cap and expander, it provides a secure mounting point inside the steerer tube for the Di2 battery, helping you hide cables and electronics out of sight. This results in a sleeker, more aerodynamic front end and reduces clutter around your bars and stem, which is especially appreciated on high-end road, gravel, and XC bikes.
Built with reliability and ease of installation in mind, the PRO Gap Cap Exp + Di2 BTR Holder offers solid clamping for your fork steerer while safely housing the Di2 battery. It is typically compatible with common 1 1/8" steerer setups that use an expander plug instead of a star nut, making it ideal for carbon forks. By combining the expander and battery holder into one tidy unit, it simplifies your build, saves small but valuable space, and contributes to a more refined, integrated look on any Di2-equipped bike.
