Works Components Angle Headset 1Deg ZS44/28.6|ZS56/40 85-98HT BlkTo suit Tapered steerer tube Upper cup Stack height: 3mm Total upper stack height including bearing cover: 8mm Lower cup Stack height: 3mm Upper Bearing: 41mm OD, 45 x 45 Degree AC sealed bearing Lower Bearing: 52mm OD, 45 x 45 Degree AC sealed bearing Split type 7075 T6 aluminium crown race for simple, tool free installation Headset comes complete with top cap (star nut included), bearings and crown race all parts required for fitment TECH SPECS