Unitary crown fork assembly and method of fabrication

摘要

A bicycle (100) is provided having a unitary steering tube-crown member (195) and a unitary crank arm-spindle member (170). A multistage aluminum 3D forging process is used to form the unitary members. This may allow the fabrication of components with substantially hollow interior areas to reduce weight, reduce part count while maintaining high strength and ductility. The multistage 3D forging process provided also allows the combination of multiple components into a single unitary part.