ITEM NAME:1-1/4" Threadless Headset MTB Bike Head Set Replacement Description: Qualified Aluminum Alloy road bike headset, lightweight, durable, turning smoothly and low noise. Fit for threadless steerer or tapered tube fork with OD. 42mm upper cup and OD. 47mm lower cup Compatible with 1-1/4" (1.25 inch) Tapered Tube Easy to adjust the bike's steering system after installation Great replacement for the worn headset that was not steerer smoothly and evenly Specification: Material: Aluminum Alloy Process: CNC Weight: 92.3g Package Includes: 1 Set Bike Headset Note: Please allow slightly difference due to manual measurement. Color may be slightly different since different monitor. Thanks! SKU: DMO0018319254040138.Fit for threadless steerer or tapered tube fork with OD. 42mm upper cup and OD. 47mm lower cup. 1 Set Bike Headset. Easy to adjust the bike's steering system after installation. Color may be slightly different since different monitor.