Ritchey Comp Cartridge Logic-E Semi Integrated Upper ZS Headset: ZS55/28.6

Engineered for modern e-bike and performance builds, the Ritchey WCS Logic-E 1.5″ Semi-Integrated ZS Upper Headset delivers a precise, smooth steering interface with clean internal cable management. Built with integrated routing channels and durable sealed bearings, it offers the reliability and sleek front-end aesthetic demanded by today’s advanced frames. Designed to work with any standard stem, it’s a refined, lightweight solution for discerning riders and builders.

Features
• Integrated cable and wire routing for clean cockpit setups
• Compatible with standard stems—no proprietary parts needed
• Durable sealed cartridge bearings ensure smooth performance
• Low stack height for a sleek, compact front end
• Designed specifically for modern e-bike and performance applications

Specifications
Material: Nylon and glass-fibre composite
Stack Height: 22.2 mm
Headtube Compatibility: 55/61 mm or 56/62 mm
SHIS Standard: ZS55/28.6 (1.5″) – ZS56/28.6 (1.5″)
Bearings: 51.85/40 mm (45°/45°) sealed cartridge
Weight: 74 g
Colour: Black