Works Components 1.0deg EC44-EC44 Angleset Headset : EC44/28.6 | EC44/40 External Threadless Complete Black Set 2 100-109mmTo suit tapered forks If you are running a 1 1 8" fork you will need to purchase the Works Components reducer crown. this headset comes as standard with a crown race to suit tapered forks Upper cup Stack height: 11mm Total upper stack height including bearing cover: 16mm Lower cup Stack height: 14mm Upper Bearing: 41mm OD, 45 x 45 Degree AC sealed bearing Lower Bearing: 52mm OD, 45 x 45 Degree AC sealed bearing Upper cup insertion depth: 9mm Lower cup