The Ritchey WCS Lower Bearing IS47/33 HT47-52 mm is a premium headset bearing engineered for robust, low-friction steering performance in bikes with an **internal 47 mm headtube** and a **33 mm fork steer tube**. Part of Ritchey’s World Championship Series (WCS), this lower bearing delivers dependable durability and smooth rotation, helping maintain precise, confident handling across road, gravel, cyclocross, and mountain terrain.

Built around high-quality sealed cartridge bearings, this lower bearing effectively resists dirt, water, and contaminants that can degrade performance over time. The precision tolerance and surface finish ensure consistent engagement with compatible headset cups, promoting long service life and minimizing drag or play in your steering system. Designed to fit HT47-52 mm headsets, this bearing supports modern frame standards and pairs seamlessly with matching upper bearings and headset assemblies.

Whether you’re replacing worn headset parts or building a new bike with performance-focused components, the Ritchey WCS Lower Bearing IS47/33 HT47-52 mm is engineered to deliver reliable performance and smooth steering feel. Its durable design and refined construction make it a go-to option for riders and mechanics who prioritize quality and longevity in critical cockpit interfaces.