Fsa is the world leading headset manufacturer and the core of their product line with many years of experience they understand that multiple dimensions and exacting requirements are a must when it comes to headsets the fsa orbit i 15mm top cap integrated headset is an integrated headset that fits cane creeks standard head tubes with a 45mm od outer diameter the bearings are angular contact bearing and the 36 degree top and a 45 degree bottom to finish it off there is a 15mm carbon top ca