Stem: Steerer Tube diameter: 28.6mm (1-1/8"), Handlebar Diameter: 3.18cm, Bike Handlebar Short Stem Replacement. Easy to Install: Connect up the original front fork stem, bolt bar clamp holds the bar securely. Material: Aluminium alloy, Ultralight, durable, high strength, and solid. Universal: short handlebar stem suitable for most road bikes, fixed gear bicycles, mountain bikes, downhill bikes, track bikes, DH, etc. DIY Modified: Suitable for modifying, DIY, upgrade the bike. Downhill, climbing, with them very comfortable. Specification: Material: Aluminum Alloy Handlebar Clamp Diameter: Approx. 3.18cm/1.25inch Front Fork Steerer: 28.6mm/1.13 inch Package Includes: 1 Bike Short Stem Note: Please allow slightly errors due to manual measurement and different monitors.