Cannondale SL Headset Compression Expanding Plug w/Flat Top Cap

Yes, this expanding plug is specifically designed for use with threadless steerer tubes, including carbon fiber, as it provides the necessary internal support without crushing the material.

Yes, the set comes complete with the expanding plug, the flat top cap, and the necessary bolt to secure the assembly and set your headset preload.

Absolutely. While it is essential for carbon steerers to prevent damage, it works perfectly fine and provides a secure fit for alloy threadless steerer tubes as well.

The flat top cap serves two purposes: it provides a clean, integrated aesthetic for your cockpit and acts as the interface to apply the correct amount of preload to your headset bearings.

You will primarily need a standard hex key (Allen wrench) to tighten the bolt, which expands the plug inside the steerer tube. A torque wrench is highly recommended to ensure you do not overtighten the assembly.