WCS Logic-E 1.5" Semi-Integrated ZS Upper Headset Stem

The Ritchey WCS Logic‑E 1.5" Semi‑Integrated ZS Upper Headset is a solution that allows cables and wires to be neatly integrated using the frame’s internal routing – and it works with any standard stem, without the need for a specialised stem design.
The cables and wires are routed through the channels in the upper part of the headset into the head tube and then continue through the space between the steerer tube and the head tube into the frame.

Technical specifications

• Material: Nylon + glass fibre
• Stack height: 22.2 mm
• Headtube ID: 55 or 56 mm
• Headtube OD: 61 or 62 mm
• S.H.I.S.: ZS55/28.6 (1.5") – ZS56/28.6 (1.5")
• Bearings: 51.85/40 mm, 45°/45°, sealed cartridge (ACB)
• Weight: 74 g
• Colour: Black
• Compression cap: Not included
• Note: The Logic‑E 1.5" ZS headset requires a bearing installation depth of 8.7 mm for the best fit. Please check compatibility with your frame manufacturer.