Fork ends and hub of bicycle

Claim 1

A hub and fork ends of a bicycle comprising: a pair of fork ends each formed on the lower portion of each leg of a front fork of a bicycle and each fixed with an annular bearing shell; a pair of annular bearings each fixed within an inside cylindrical hole of a respective one of each said annular bearing shell; a hub having spokes of a bike wheel; and a spindle formed with a male-threaded end to be fixed by a nut on the fork ends; the improvement which comprises: each said annular bearing including: an outer race fixed within said annular bearing shell and formed with an annular hole therein and extending an annular rib from the central portion of said annular outer race; an inner race comprising a first ring which is formed with a central hole for receiving said spindle, a male-threaded portion and an annular groove thereon, and a second ring which is formed with a female-threaded hole engaged with said male-threaded portion of said first ring and another annular groove which forms a common ball seating surface with said annular groove of said first ring within said annular hole of said outer race to define a pair of ball retaining spaces with said annular hole of said outer race as separated by said annular rib of said outer race; and a plurality of balls movably arranged within said pair of ball retaining spaces; said hub formed with several transverse grooves through a central hole in said hub; and said spindle formed with several lengthy extensions corresponding to said transverse grooves so that after passing said spindle through said pair of annular bearings and said hub, said hub with a bike wheel can be instantly fitted on the fork ends by said nut.