What are the different types of mountain bike steering stems available in the market and how do they impact the overall performance and handling of the bike?

There are mainly two types of mountain bike steering stems available in the market: quill stems and threadless stems. Quill stems are older and have a traditional design, while threadless stems are more modern and commonly used today. The type of stem can impact the overall performance and handling of the bike by affecting the bike's responsiveness, stiffness, and adjustability. Threadless stems are generally lighter and stiffer, providing better control and precision, while quill stems offer more adjustability in terms of height and angle. Ultimately, the choice of steering stem depends on personal preference and riding style.