Needle bearing headsets last as long as your bike. Compared to cartridge bearing headsets, a small amount of extra friction greatly reduces the risk that your bike shimmies, without affecting steering or handling. Our precision-machined headsets spin smoothly even under hard braking. The Low Stack headset is designed to fit on most bikes as a direct replacement for a worn headset. The Ultimate headset has inverted bearings in the top race to resist twist during braking. On the Ultimate headset, circlips keep the bearings inside the cups when you take out the fork for travel. Either Rene Herse headset will be the last headset you install on your bike.