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The PRO Gap Cap Expander Superlight is designed for riders who want a clean, secure, and lightweight solution for preloading their headset on carbon or alloy steerer tubes. Acting as both an expander plug and top cap system, it replaces traditional star nuts, making it ideal for modern road, gravel, and mountain bikes with carbon forks. Its superlight construction helps keep overall bike weight down while still providing reliable clamping force to keep your headset running smooth and free of play.
This expander is especially useful when upgrading to a carbon fork or building a high-performance bike from the frame up. By expanding inside the steerer tube, it distributes pressure more evenly than a star nut, helping to protect delicate carbon structures. The low-profile top cap gives your cockpit a sleek, professional look and works seamlessly with most common stems and spacers. Whether you are a weight-conscious racer or a meticulous bike builder, the PRO Gap Cap Expander Superlight offers a simple, effective way to finish off your headset installation with confidence and style.
