The Cervelo Top Cap Plug 338 is a small accessory designed to finish the headset area with a clean, finished appearance while protecting internal components of compatible Cervelo frames. It covers the top of the steerer tube and headset interface, helping prevent dirt, moisture, and debris from entering sensitive areas that could compromise bearing performance or long-term durability.

This top cap plug is engineered to match the diameter and contour of the 338-series headset interface used on select Cervelo frames. Its precise fit ensures a secure seating that resists movement under vibration and riding loads while maintaining the intended aesthetic of the cockpit area. Installation is straightforward, requiring correct alignment and gentle seating into the head tube opening.

Constructed from durable materials, the plug resists corrosion and wear from regular use, contributing to reliable protection over time. Its presence aids in maintaining smooth steering performance by helping to keep the headset area cleaner and reducing the risk of grit or moisture intrusion that can accelerate wear. The top cap plug is intended for riders seeking a neat finish and practical protection for their frame’s headset interface.