Headset bearings sit directly in your steering force path, which means any roughness or play translates immediately into vague handling and that annoying creak that develops mid-ride. The Ritchey WCS Logic Upper Headset Assembly addresses the top half of your headset with a complete drop-in unit designed for ZS44 head tubes and standard 28.6mm steerers—the most common upper headset spec on modern road and gravel frames. This isn't a bearing-only replacement; you get the pressed cup, sealed cartridge bearing, compression ring, and top cap as a matched assembly, which eliminates the guesswork of sourcing individual components that may or may not play well together.

The ZS (Zero Stack) designation means the bearing sits inside the head tube rather than on top of it, keeping your stack height lower than external cup designs while still providing a serviceable cartridge bearing that can be replaced when it eventually wears. Ritchey machines the cup from aluminum and pairs it with a steel cartridge bearing sealed against contamination—a combination that balances corrosion resistance at the frame interface with the durability that steel bearing races provide under steering loads. The 44mm cup outer diameter fits the internal ZS44 standard, while the 28.6mm bore accommodates 1-1/8" steerers without adapters or shims.

If your current upper headset has developed notchiness, looseness, or that grinding sensation when you turn the bars, this assembly provides everything needed to restore proper steering feel without hunting down individual components. The Logic line represents Ritchey's mid-tier offering—a step below the WCS in terms of weight optimization but using the same bearing quality and manufacturing standards. For riders replacing a worn headset or building up a frameset, this upper assembly pairs with Ritchey's lower headset units to create a complete system matched to your frame's specific head tube configuration.... Read More