Structure according to claim 1 wherein said freewheel has an axle bore coaxial with said hub bore when mated, and including two ring bearings mounted in said hub bore substantially between said endwalls, and said freewheel bore is of smaller diameter than said axle bore such that said freewheel radially inwardly overlaps a substantial portion of said bearings seated in said axle bore to capture same and minimize the minimum overall diameter of said freewheel assembly to permit the use of sprockets on said freewheel having a minimum number of teeth.ħ. Structure according to claim 1 wherein said hub endwalls are identical with one another, having identical keying structure such that said freewheel can be mounted to either of said endwalls.Ħ.
Structure according to claim 3 wherein said sidewall is screwed to said one endwall by screws threaded through said sidewall into the respective bosses.ĥ. Structure according to claim 2 wherein said concavities comprise a plurality of bosses extending outwardly from said one endwall engageable with a corresponding plurality of recesses defined in said sidewall which closely fit over the bosses.Ĥ. Structure according to claim 1 wherein said keying structure defined by said one endwall and the sidewall comprise concavities mateable with corresponding convexities, said concavities and convexities being characterized by having substantial engaging axial components to positively mutually engage against mutual rotation.ģ. (e) attachment means for retaining said freewheel on said hub substantially, functionally independently of said keying structure.Ģ. (d) interfitting keying structure defined by said sidewall and by one of said endwalls such that when said sidewall and said one of said endwalls are mated, said keyed structure engages said hub unit and freewheel unit to positively prevent axial rotation therebetween such that torque applied to said freewheel unit is transmitted to said hub as substantially 100% torque with substantially a 0% axial force vector and (c) a self-contained freewheel unit defining a mounting sidewall mateable against one of said endwalls (b) said hub unit defining two substantially identical hub endwalls around the end of said bore
(a) a hub unit defining a rotational axis with an axle bore substantially coaxial with said axis A bicycle hub and freewheel assembly comprising:
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