Fit: Specifically designed for bicycles with a 22.2 mm front fork inner diameter, 25.4 mm outer diameter, and a 30 mm head tube inner diameter. This headset provides a secure, stable installation for fixed gear and racing bikes, reducing wobble and improving handling. Long lasting construction: Lightweight aluminum alloy with CNC processing and plating treatment for durable performance and resistance. Built to withstand intense cycling conditions without frequent replacements. Smooth bearing mechanism: 1inch threaded design with bearings that deliver seamless steering and reduced friction, enhancing ride responsiveness and control on varied terrains. Easy installation: Size specifications are 22.2x30x27 mm, height 39 mm, weight 86 g. Always refer to the seller's size chart to confirm compatibility before for a hassle fit. Compatibility and notes: Designed to support secure and stable installation on fixed gear and racing bikes that match the specified dimensions. Use scenarios Upgrading a fixedgear or track bike to improve steering precision and stability during city riding or track sessions. Replacing a worn headset on a road racing or criterium bike to restore smooth steering and quick handling on fast descents and varied terrain. Building a lightweight, durable performance setup for endurance rides or aggressive training where reliability under demanding conditions is important.