A bicycle hub assembly includes {HEAD ~ two end caps} which are {TAIL ~ two collar shaped member} and an axle is connected between the two end caps 
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A bicycle hub assembly includes { HEAD ~ two end caps } which are { TAIL ~ two collar shaped member } and an axle is connected between the two end caps
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH