FSA Bike Bicycle Cycle Orbit C-33 High Quality For Differnetial OD Headtube 9mm Black

1.1/4 bottom, 1.1/8 upper, 4545 ACB (for carbon fibre headtube)

For differential headtube upper 1.1/8, Lower 1.1/4

Stainless steel Angular Contact Bearings

Stack height: 11.3 + 3 = 14.3mm

For carbon fibre headtube

7075T6 crown race

Steerer : 1.1/8-1.25"

Brand Name : FSA

Upper : 41.8mm

Lower : 46.8mm