The Specialized S-Works Venge Carbon Seatpost uses an aerodynamic FACT carbon construction & is compatible with the 2019 Specialized Venge bikes & framesets. The Venge Carbon Seat post is available with either 0 or 20mm offset & 300 or 390mm lengths. Features Sleek Di 2 integration hides the Di 2 junction box inside. Cylindrical aluminium head assembly adjusts fore/aft & tilt with a single bolt. Setback: 0/20mm