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well most hub designs are double bearing leading to a decent life span for the bearings(two bearings really close would probably lead to one failing pretty quickly; think weight over distance); the hub centric design is so anyone can center the wheel(lowest common denominator); and it probably cuts down on the number of studs needed to carry the cars weight fully loaded(that and you can technically drive a good distance with only missing one lug nut from each of the tires)
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