Redshift Switch Aero System - Quick-Release Clip-On Aerobars/Dual-Position Seatpost - Aluminum Extensions Quick-Release Aerobars and Dual-Position Seatpost let you switch between road and aero positions on the fly. Aerobars attach or remove in seconds, without using any tools. Choose the perfect setup for every ride. Wide range of aerobar adjustability lets you dial in a perfect fit - pad width, height, fore-aft, and rotation; extension reach. The seatpost's forward 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 seatpost linkage design maintains constant saddle-to-pedal distance in both positions, ensuring proper leg extension in road and aero.