No tubes. No path. No waste of energy. Not a single thing in terms of experience. We've created a reliable wireless electronic dropper post and controller that operates with dramatically less effort and zero distractions. Expanding what's possible on a bike, Reverb AXS is enabled by SRAM AXS™ technology, a new level of interaction, customization and connectivity between all AXS-enabled components. SRAM's new bicycle component integration system that connects bicycle electronics and software. The SRAM AXS app allows riders to view battery status, change component behavior, customize controls, receive maintenance reminders and update firmware. Vent Valve technology allows you to perform this simple service in just a few steps without any dismantling of the pole. Press the valve, compress the pin, reset. The air is channeled back into the inner tube leaving the oil in its place and bringing you back to more reliable and safe performance.