Headset bearings are one of those parts you don't think about until the steering goes notchy or you feel play in the front end when you rock the bike against the brake. The Ritchey WCS Lower Bearing IS47/33 is the drop-in replacement for the lower position on frames running the 1-1/4" integrated standard, and it covers the same WCS-grade construction Ritchey specs on the Road Logic and Swiss Cross — alloy bearing carrier, sealed cartridge internals, and titanium-coated races for corrosion resistance.

The bearing itself measures 41.8mm by 34.1mm by 8mm with a 45°/45° angular contact orientation, which is the geometry the lower position needs to handle both steering loads and the axial hits that come from potholes, curb drops, and hard front-end impacts. Sealed cartridge construction keeps water and grit out of the races, and Ritchey packs them with their high-webbing grease before the bearing leaves the factory.

IS47/33 is one of the more common modern road and gravel standards, but headset specs have proliferated to the point where a 1mm difference in head tube bore matters. Before ordering, confirm your frame is spec'd for IS47/33 — that's a 47mm head tube inner diameter at the lower position paired with a 33mm crown race seat on the fork. The assembly includes the crown race, so you've got the matching interface for your fork's lower steerer.... Read More