Top 45x45 ACB;Bottom 36x45 ACB;For differential headtube OD headtube

• FSA Orbit C-40 ACB, Diff Headtube Integrated Headset - Black, 1.1/8.5-Inch/9 mm
• 1.1/8.5-Inch/9 mm Inch
• Black

FSA Orbit C-40 ACB, Diff Headtube Integrated Headset - Black, 1.1/8.5-Inch/9 mmFSA