One element of the bicycle that is often overlooked and willingly is the headset. It is the contact element between the sleeve of the fork and frame, it allows the rotation and smoothness, giving the rider a precise and direct steering. The market provides different standards according to the use for which it is the frame is designed : 1 "threaded headsets for road and fixed, integrated and semi-integrated in various sizes with regular diameters or differentiated for the most modern and MTB road bike and different types of internal bearings from classical steel up to the ceramic top range.