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The PRO Headpart Expander Long is designed to provide a secure and reliable interface between your carbon or alloy steerer tube and your stem. Instead of relying on a traditional star nut, this expander plugs into the steerer and expands internally, creating a firm anchor point for your top cap and preload bolt. This helps you correctly preload your headset bearings, keeping your steering smooth, precise, and free from play, while also protecting delicate carbon steerers from damage caused by conventional star nuts.
Ideal for modern road, gravel, and mountain bikes with threadless headsets, the PRO Headpart Expander Long offers extended contact inside the steerer for improved stability and clamping security. It is especially useful on carbon forks, where even load distribution is essential for long-term durability and rider safety. Easy to install with standard workshop tools, it’s a simple upgrade that can make headset setup more consistent and maintenance more straightforward. Whether you are building a new bike or refreshing an existing cockpit, this expander is a small component that plays a big role in overall ride quality.
