The stem is an important part of the steering system on a bicycle. It connects the handlebars to the fork of the bicycle. The stem allows the position of the handlebars to be adjusted in relation to the fork and the rider.
Typically, the stem consists of a short, tubular element that attaches to the fork of the bike at one end. At the other end there is a clamp that holds the handlebars. This design allows the handlebars to be adjusted in height and sometimes also in the forward or backward position.
The length and angle of the stem can vary, affecting the riding position and handling of the bike. A longer stem can result in the rider sitting more stretched out and aerodynamically, while a shorter stem can result in a more upright riding position. The angle of the stem can also affect reach and comfort.
The stem plays an important role in the ergonomics and handling of the bike, as it allows the position of the handlebars to be adjusted to the individual preferences and needs of the rider.