Description: 【Sealed Bearing】: This bike headset features sealed deep groove ball bearings with a metal seal, ensuring high speed performance, The design effectively retains lubricants within the bearings, providing good dust and water resistance for smooth and effortless fork integration 【Double Layer Sealing】: The bicycle headset with double layer sealed cap offers waterproof and dustproof protection compared to traditional stacked structures, This innovative design ensures fit between the cap and upper cup, enhancing overall sealing performance 【Compatibility Specifications】: Designed for frames with a head tube inner diameter of 44MM (both top and bottom) and suitable for straight tube forks with an upper outer diameter of 28.6MM and lower outer diameter of 39.8MM 【Construction】: Made from quality aluminum alloy, this bike headset is built to withstand rigorous use while maintaining lightweight properties essential for optimal bike performance 【Compact Dimensions】: With product dimensions of 6.2 x 6.2 x 5.5 CM, this headset is compact yet sturdy, making it an ideal choice for cyclists seeking reliable front fork accessories Specification: Material: Aluminum Alloy Size Chart: 6.2cmx6.2cmx5.5cm/2.44inchx2.44inchx2.17inch Package Includes: 1 Bike Headset Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.