There's no denying that Pivotal seat/post technology is a staple in the BMX world in both the freestyle and race markets. The Haro 27.2mm Pivotal post is intended for the race market being that most BMX race frames (Expert XL and larger) require a 27.2mm diameter post versus freestyle bikes which require a 25.4mm diameter post. Made from 6061 aluminum, the Pivotal post is a light and simple design.