FSA Orbit C-33 Carbon Headset Designed for the tapered steerer standard, the FSA Orbit C-33 Carbon Headset is a premium quality headset with high build quality. It has a 1 1/8 inch angular contact bearing at the top and a 1 1/4 inch bearing at the bottom. Both bearings drop into the frame into the built-in races, and there's a gorgeous carbon fiber top cover to finish things off. The headset is compatible with carbon or alloy head tubes, and features angular contact bearings for smooth, precise operation. FSA Orbit C-33 Carbon Headset Specifications: Stack height: top 11. 3mm, bottom 3mm For tapered 47mm/52mm OD head tube For 1 1/8 inch to 1 1/4 inch tapered fork Weight: 91 grams | Fsa | Orbit C-33 Carbon Headset Is42/28. 6 | Is47/33