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The PRO Gap Cap Expander Long is designed to give your cockpit a clean, secure and reliable interface between your fork and stem. Instead of relying on a traditional star nut, this expander plugs into your steerer tube and provides a solid anchor point for your top cap and preload bolt. It is especially well suited for carbon steerer tubes, where star nuts are not recommended, but it can also be used in many alloy steerers for riders who want a more refined and serviceable solution.
With its extended length, the PRO Gap Cap Expander Long offers a larger contact area inside the steerer, helping to distribute clamping forces more evenly and reduce the risk of damage. This makes it a smart upgrade for performance road, gravel and mountain bikes alike. Installation is straightforward: slide the expander into the steerer, tighten it to the recommended torque, and then use your top cap to set headset preload as usual. The result is precise steering, quiet operation and a professional finish to your front end setup.
