Description <br> Description: <br> Traditional and integrated type replacement headset crown races. <br> Made of quality aluminium alloy material, high strength, anti-rust, and durable. <br> Easy to install and carry. <br> Suitable for 44-56mm headset. <br> Useful accessory for bike lovers to DIY their bikes. proper fit to the tube of most bikes. <br> Specification: <br> Material: Aluminium Alloy <br> C Base: <br> Fit for 1.5inch tapered fork <br> Outer Diameter: 51mm <br> Inner Diameter: 39.7mm <br> Bearing angle: 45 degree <br> D Base: <br> Fit for 1.5inch tapered fork, 28.6mm(2.13inch) straight fork <br> Frame head tube diameter: 41.8-52mm/1.65*2.05inch <br> Outer Diameter: 51mm <br> Inner Diameter: 29.9mm <br> Bearing angle: 45 degree <br> Package Includes: <br> 1 Piece Bike Headset Base Spacer <br> Note: <br> 1. Please allow slightly error due to manual measurement. <br> 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. <br> 3. Wish you a wonderful on-line shopping! <br>