Headsets ensure a low steering play and smooth steering movements of the fork. The headset is installed in the head tube and serves to store the bicycle fork. However, the enormous variety of headsets makes it difficult to find a retrofitting one. In modern bicycles, ahead headsets are often used. They combine a stem clamped via the upper bearing shell with a continuous steerer tube, in which the two bearing shells are mounted within the frame. When buying, always pay attention to the specified dimensions.