Bike Hidden Headset for IS52 28.6mm Straight Steerer Upper and ZS56 40mm Tapered Steerer Lower with 6.5mm Compression

Feature: 1. Compatibility: This internal headset is engineered for frames with IS52 upper (28.6mm straight tube) and ZS56 lower standards (40mm tapered steerer), , enabling seamless transition between different standards while ensuring secure installation and accurate steering. 2. Integrated Internal Routing Channels: Features built in fully hidden cable routing channels that support hydraulic brake lines and electronic shifting systems passing through the head tube. Completely hides cables within the frame for enhanced aesthetics and aerodynamic performance while eliminating external cable wear risks. 3. High Strength CNC Aluminum Construction: Manufactured from aluminum alloy through CNC integrated machining for robust yet lightweight structure that effectively protects internal bearing systems. The low section design creates a nearly invisible appearance when installed, enhancing integrated visual appeal. 4. High Accuracy Sealed Bearings: Equipped with dual lip sealed bearings offering exceptional dust and water proof capacities. Provides smooth steering performance for long term use in mountain biking, downhill, and all weather riding conditions. 5. Easy Installation And Maintenance: Modular structural design enables assembly and disassembly without special tools. Compatible with mainstream forks and internal routing layouts, making it an ideal solution for upgrading traditional external headsets to premium concealed cable systems. Specification: Item Type: Bike Headset Material: Aluminum Alloy, CR MO. Package List: 1 x Star Nut1 x Headset Cap1 x Compression Ring2 x Bearings2 x Spacers3 x Additional Components