Woodman 1 inch 1/8 headset expander

Woodman headset expander plug for 1 1/8" fork steerer tube

The Woodman headset expander plug is an essential component for properly preloading the headset on bicycles equipped with a hollow fork steerer tube. Lightweight, durable, and easy to install, it is the ideal alternative to a star nut, especially for carbon steerers where an expander plug is highly recommended.

Why choose the Woodman headset expander plug ?

Made from high-quality aluminium, the Woodman expander plug provides an excellent balance of strength and low weight. It allows accurate headset adjustment while evenly distributing clamping forces inside the steerer tube, helping to protect the fork from unnecessary stress.

Designed for 1 1/8" (28.6 mm) fork steerers, it fits steerers with an internal diameter between 24 mm and 25.4 mm.

Its reliable expansion mechanism ensures a secure hold, making it suitable for road bikes, mountain bikes, gravel bikes, hybrid bikes, and many other cycling disciplines.

Technical specifications

• Brand: Woodman

• Product Type: Headset Expander Plug

• Compatible Steerer Size: 1 1/8"

• Steerer Outer Diameter: 28.6 mm

• Compatible Inner Diameter: 24 to 25.4 mm

• Material: Aluminium

• Weight: 45 g

• Condition: Brand new in original packaging

Perfect for carbon fork steerer tubes

Unlike a traditional star nut that must be driven into the steerer tube, the Woodman expander plug is specifically designed for carbon fork steerers. It provides secure support for the top cap bolt while reducing the risk of damaging the carbon structure.

It can also be used with compatible aluminium steerers whenever recommended by the fork manufacturer.

Quick and easy installation

Installation takes only a few minutes. Simply insert the expander plug into the fork steerer and tighten the bolt until the expansion mechanism locks securely inside the tube. Once installed, it allows precise headset preload adjustment before tightening the stem bolts.

Key benefits

• Fits 1 1/8" (28.6 mm) hollow fork steerers.

• Compatible with 24–25.4 mm internal diameters.

• Lightweight and durable aluminium construction.

• Weighs only 45 grams.

• Evenly distributes clamping pressure inside the steerer.

• Ideal for carbon fork steerers.

• Brand new in original retail packaging.

Why replace your headset expander ?

Over time, repeated installation and removal can reduce the effectiveness of an expander plug. Replacing a worn component helps maintain proper headset adjustment and ensures a secure stem installation. A high-quality Woodman expander plug also contributes to the long-term protection of your fork steerer.

Order your Woodman headset expander plug

Whether you ride a road bike, mountain bike, gravel bike, or commuter bike, the Woodman aluminium headset expander plug is a dependable solution for secure headset adjustment. Lightweight, durable, and designed for 1 1/8" (28.6 mm) hollow steerers, it delivers reliable performance for demanding cyclists.