1 Inch Threaded REF#: 173314 Lowrider Threaded Steel Headset 21.1x32.5x27mm Chrome. Lowrider Steerer OD: 1 Inch (25.4mm)Cup: 32.5mmSize: 1 Inch (21.1mm)Race: 27Material: SteelStyle: BmxColor: ChromeType: ThreadedBrand: Lowrider Sign In to view pricing and availability