Wolf Tooth Compression Plug with Integrated Spacer Stem Cap – Black

This Wolf Tooth compression plug provides the internal anchor needed to correctly preload the headset on bikes with carbon steerer tubes. It replaces a star nut, which should never be used in carbon steerers.

The included stem cap has an integrated 5mm spacer, which helps meet common fork manufacturer requirements where the steerer must extend slightly above the stem for proper clamping and load distribution.

Key Features
• Compression plug for setting headset preload on carbon steerer tubes
• Integrated stem cap with built-in 5mm spacer
• CNC-machined 7075-T6 aluminum construction
• External cap and internal plug designed to work as a matched system
• Clean, low-profile top cap design

Compatibility & Use Notes
• Fits 1 1/8" steerer tubes
• Designed for carbon steerers
• Also compatible with metal steerers with internal diameters from 23.5 mm to 24.5 mm
• Not compatible with forks requiring a star nut
• Spacer is integrated into the stem cap and not removable

Service / Ownership Context
Correct installation depth and torque are critical. The plug must sit below the top of the steerer so the stem can clamp properly without loading the cap. This is a common service item during new bike builds, fork replacements, or stem height adjustments, and it should be checked any time the cockpit is reconfigured.

Fit & Use Signals
• Good fit if you have a carbon fork with a 1 1/8" steerer
• Good fit if your fork requires steerer extension above the stem
• Good fit for road, gravel, and mountain bikes
• Not a fit if your fork uses a star nut system
• Not a fit if your steerer tube diameter falls outside the specified range