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

The semi-integrated Ritchey Logic-E headset upper part allows the internal frame routing of electric wires and cables or cable housings without the need for a special stem. The cables are simply inserted through channels on the top of the headset and routed through the space between the steerer tube and head tube before entering the frame. Technical details of the Ritchey Logic-E headset level: Comp type: Ahead (threadless), Zero Stack (ZS, semi-integrated) material: nylon, glass fiber reinforced plastic only suitable for 1.5" head tubes outer diameter steerer tube: 28.6 mm (1 1/8") outer diameter cup: 61 mm inner diameter cup: 55 mm stack height: 22.2 mm bearings: 51.80 / 40 mm | 45° / 45° | cartridge (ACB), sealed weight: approx. 74 g (manufacturer's specification) Scope of supply: headset upper part (without Ahead cap)