Road Bicycle Headset Origin8 Pro Threaded 1 Inch Cartridge Bearings Black New Sealed cartridge bearings CNC machined 6061-T6 aluminum alloy cups with laser etched logos 26.4mm & 27.0mm races included 110g including lock nut Type: Threaded Size: 1 Inch Color: Black Steerer Diameter: 22.2 Cup Diameter: 30.2 Crown Race Size: 26.4/27.0 Stack Height: 42.5