Headsets
Headsets fall into several categories (see below). There are external cup threadless headsets, which must be pressed into the frame. Another commonly used type is the zero-stack semi-integrated threadless headset, which also must be pressed into the frame, but unlike external cups, the cups sit flush with the headtube. Drop-in headsets have the bearing seats molded or machined directly into the frame where the cartridge bearings sit. The oldest and now uncommon type is the threaded headset.
Force expander for carbon steerer tube 1 1/8" 32 mm
Star nut for a carbon fork steerer tube with a diameter of 1 1/8". Length 32 mm.
Force Ahead 1" headset black
Classic headset for a 30 mm head tube, with an inner diameter of the lower ring of 27 mm.