Nukeproof generator rear hub sram xd 3 in 1nukeproof generator hubs are essential components for any high grade wheelset providing smooth and long lasting bearing performance a light weight that belies their ability to take hard knocksa tough but lightweight 7075 series aluminium main hub body features cold forged construction for optimum strength and fatigue resistance while extensive cnc machining shaves excess weight without compromising structural integrity the hub features a total of