Track crank, also for use with internal gear hubs such as the Sturmey 3speed fixed and 2speed kickback\n Forged 6061 aluminum crank arm/spider with square BB taper \n Includes CNC machined, black anodized 7075 aluminum chainwheel (46 or 48t) \n *BB sold separately: use UR1961 103mm for 42mm chainline, UR1963 107mm for 43.5mm chainline\n 685g with ring