Not a single thing in the way of the experience. Our intention with Reverb AXS was inventive and pure: No hoses. No routing. No energy wasted. Not a single thing in the way of the experience. We created a reliable wireless electronic dropper post and controller that actuates with drastically less effort and zero distraction. Expanding what's possible on a bike, Reverb AXS is enabled by SRAM AXS technology, a new level of interaction, personalization, and connectivity across all AXS-enabled components. Specifications Note: Most Polygon bikes have a seat tube diameter of 30.9mm. If you're unsure, please contact our tech team and they will help you determine the correct size. TRAVEL 170mm POST DIAMETER