White Industries lightest hubset, designed specifically for road bikes 6al4v Titanium freehub body 11 speed (9/10 speed compatible when used with included spacer - except XD) Hub design maximizes aerodynamic efficiency AL6061 aluminum hub shell RR 8-11s Cass 28H QR AL6061 Blk 252g RIM 130mm 40.5 55 35 18