1 1/8 in

Features: 1.Durable, smooth, light-weight, long-lasting headset, representing the perfect balance of performance. 2. suitable for MTB, road bike, convenient and durable. 3. 1-1/8" Threadless headset Completed with star nut and bolt. 4. It's necessary for your bicycle accessories. 5. Bicycle Headset only, other accessories demo in the picture is not included!100% brand new and high quality Properties: Brand: JESSICA Material: Aluminum alloy CNC machining Surface treatment: the anode Fit for 44-56mm Tapered frame head tube Fit for 28.6mm(1 1/8") to 39.8mm(1 1/2")Steerer Tube Weight: 130g,approx Package included: 1pc*Headset Features:1.Durable, smooth, light-weight, long-lasting headset, representing the perfect balance of performance.2. suitable for MTB, road bike, convenient and durable.3. 1-1/8" Threadless headset Completed with star nut and bolt.4. It's necessary for your bicycle accessories.5. Bicycle Headset only, other accessories demo in the picture is not included!100% brand new and high quality Properties:Brand: JESSICAMaterial: Aluminum alloy CNC machiningSurface treatment: the anodeFit for 44-56mm Tapered frame head tubeFit for 28.6mm(1 1/8") to 39.8mm(1 1/2")Steerer TubeWeight: 130g,approxPackage included:1pc*Headset