Prime rd010 disc road rear hub prime rd010 disc brake rear road hub is the pinnacle of our range and features a superlight forged alloy 7075 hub body that has been cnc machined to further reduce weight without compromising structural integrity the added grease port for home maintenance will 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