Prime ro20 road rear hubthis prime r020 rear road hub features a superlight forged alloy 7075 hub body that has been cnc machined to further reduce weight without compromising structural integrity a grease port has been added for home maintenance to further prolong bearing life and reduce service intervals our hubs run on premium japanese sealed cartridge bearings for ultra low friction and superior bearing life comprising of two in the hub body and two in the freehub body the freehub body has