FSA Unisex's Orbit C-40 ACB Integrated Headset, Black, 1.1/8-1.5-Inch/8 mm
Top 45°×45° ACB. Bottom 36°×45° ACB. Style: Orbit C-40 ACB, Diff Headtube. Bottom 36°x45° ACB. Top 45°x45° ACB. For carbon fibre special steerer. Stack Height 8.5 + 0.9 = 8.9mm. For differential head tube OD head tube.