The Ritchey WCS Lower Headset Assembly IS52/40 1.5" is a high-performance component designed for modern bikes that use an **internal 52 mm headtube** and a **40 mm fork steer tube** (1.5"). Part of Ritchey’s World Championship Series (WCS), this lower headset assembly delivers dependable smooth steering, robust bearing support, and long-lasting durability — ideal for aggressive trail riding, gravel exploration, and all-around mountain performance.

At the core of this assembly is a premium sealed cartridge bearing engineered to resist water, dirt, and contaminants that can degrade headset performance over time. The precision-machined cups and bearing interface ensure low-friction rotation and confident handling, helping you maintain control and responsiveness across varied terrain. The robust construction and fitment quality also contribute to overall headset life and performance consistency.

Installation is straightforward with standard press-fit tooling suited for the IS52/40 specification. This lower headset assembly pairs seamlessly with compatible upper components, offering a cohesive and reliable steering interface for your bike. Whether you’re upgrading worn parts or building a new ride from scratch, the Ritchey WCS Lower Headset Assembly IS52/40 1.5" brings premium performance backed by Ritchey’s race-tested engineering.