One ride over varied terrain with an adjustable seatpost beneath you is all it takes to make you a believer. The enhanced comfort, control and confidence that comes from being able to instantly lower the saddle for descents and technical sections, and then just as quickly return it to its original (or an intermediate) position, becomes habit forming. Before you know it, you'll be adjusting your seatpost on the fly without even thinking about it. The Rock Shox Reverb is one of the best adjustable seatposts out there. It offers a full 125mm of rise with infinite adjustability, exhibits absolutely no side-to-side play and features an adjustable return speed. It comes complete with an oil bleed kit for customising tubing length to fit your bike's size and setup.