Headset Origin8 Threadless Pro Cartridge Bearing 1 Inch Silver Sealed cartridge bearings Alloy cups w/ Laser etched logo 136g (incl. top cap and star nut) Type: Threadless Size: 1 Inch Color: Silver Steerer Diameter: 25.4 Cup Diameter: 30.2 Crown Race Size: 26.4/27.0 Stack Height: 30