The bicycle headset is one bike part that is often overlooked. Yet, it serves a vital function in getting you safely down the road. The headset serves as the interface between your bike stem and bike fork steerer tube, allowing the stem to pivot smoothly as you turn your bicycle handlebars. Most modern headsets contain sealed bearings which are placed under great load as your front wheel makes impact as you are riding. The headset bearings are held in what are called the races, and there is one at the top of your bicycle head tube where the stem inserts, and there is another race at the bottom where the bicycle forks meet the head tube. Far and away, the most famous bike headset manufacture is Chris King, which makes a beautiful, highly machined, and ever reliable headset that is known to last for the life of your bicycle. Literally, other headsets will start to grind or feel gritty over extended years of bike riding, but the superb quality sealed bearings in Chris King headsets make them the industry standard.