Redshift Dual-Position Seatpost Aluminum (27.2mm x 350mm) Switch between road and aero positions on the fly. Adapt to conditions you encounter during your ride. Climb comfortably in the road position and hammer the flats in the aero position. The forward seatpost position replicates the steeper seat tube angle of a tri bike, opening your hip angle and letting you ride comfortably and powerfully in the aero position. The patent-pending linkage design maintains constant saddle-to-pedal distance in both positions, ensuring proper leg extension in road and aero. Part of the Switch Aero System