Aluminum construction, performance crankset at a fraction of the cost of other performance sets while boasting similar features Innovative 4-arm spider design that trickles down all the way from the Super Record� version to allow for an independent BCD -increased rigidity and structural integrity Double standardized bolt circle diameter allows for use of standard, mid-compact and compact chainrings Compatible with 130mm hubs 172.5x50/34 UT BLK 146/112mm Campy 865g 2x11