PRO Cap Carbon 1-1/4-inch bicycle headset spacer set - PRHS0119

The PRO Gap Cap Expander Carbon PRHS0119 headset expander is designed for cyclists who wish to lighten their handlebar setup without compromising compatibility with their carbon fork. Weighing just 24 g, this accessory combines an alloy body with a carbon top cap for a lightweight and refined finish.

Designed by PRO, a specialist in cycling components and accessories, this expander is an ideal solution for sport-oriented builds and performance-focused set-ups, particularly when paired with the lightweight handlebars from the PRO Vibe Superlight range.

An expander designed for 1-1/4-inch fork steerer tubes

The PRO Gap Cap Expander Carbon PRHS0119 is designed for carbon fork steerer tubes compatible with a 1-1/4-inch diameter. It provides the internal support required to adjust the headset preload, in accordance with the fork manufacturer’s specifications.

This system is particularly suitable for carbon steerer tubes where a conventional headset star is not compatible. To ensure a reliable fit, it is essential to adhere to the insertion depth and tightening torques recommended by the manufacturer.

An aluminium and carbon design to minimise weight

The expander body is made from an alloy, whilst the top cap is made from carbon. This combination reduces the overall weight whilst maintaining a discreet finish, suitable for performance bikes.

Weighing just 24 g, the PRO Gap Cap Expander Carbon offers a claimed weight saving of 16 g compared to the previous model. It is an attractive option for cyclists looking to optimise their build right down to the headset components.

Compatible with various stem set-ups

The manufacturer states that it is compatible with all stems. This versatility makes it easy to integrate into a wide range of handlebar set-ups, provided the dimensions and fitting instructions for the components used are followed.

Part number PRHS0119 corresponds to the version for a 1-1/4-inch steerer tube. For a 1-1/8-inch steerer tube, select part number PRHS0118.

Technical specifications

• Brand: PRO
• Model: Gap Cap Expander Carbon
• Manufacturer’s part number: PRHS0119
• Compatible pivot diameter: 1-1/4 inches
• Length: 25 mm
• Body material: alloy
• Upper cap material: carbon
• Claimed weight: 24 g
• Intendeduse: compatible with carbon pivot forks
• Stem compatibility: all stems, subject to fitting specifications
• Alternative part number: PRHS0118 for 1-1/8-inch steerer tube