Specialized Narrow Diameter Expander Plug for Carbon Forks Description: This Specialized Narrow Diameter Expander Plug for Carbon Forks is a replacement for expander plugs found equipped on select Specialized bikes. Suitable only as a replacement for bikes originally equipped with the same plug, this model-specific piece works to accommodate the narrow inner diameter of steerer tubes found on forks equipped originally on models such as Aethos 2 and Crux 5. Note: Plug should be oriented with the arrow pointing to the front of the bike when being installed onto forks Features: Genuine Specialized replacement parts Lightweight headset compression plug for Specialized bike models with carbon fiber steerer tube forks Approved for use with forks featuring narrow inner diameter steerer tubes Compatible with M6x1.0P thread top cap bolts