The PRO Expander Short is a compact, high-quality expander plug designed to provide a secure and reliable interface between your carbon or alloy steerer tube and the stem. Instead of relying on a traditional star nut, which is not suitable for carbon steerers, this expander uses an expanding sleeve to grip the inside of the steerer safely and evenly. This helps you preload the headset bearings correctly while protecting the steerer from damage, crushing, or unwanted stress points.
Ideal for road, gravel, and cross-country mountain bikes with shorter steerer sections, the PRO Expander Short is a great choice when you want a clean, low-stack solution that works perfectly with modern headsets and top caps. Its robust construction and precise fit help maintain smooth steering and long-term headset performance. Easy to install with standard workshop tools, it’s a simple upgrade that adds confidence to your cockpit setup, especially on high-end carbon forks where proper support and clamping are essential.