The RockShox Reverb AXS XPLR dropper post delivers more control confidence and fun on gravel roads everywhere. Getting the saddle out of the way means more room to move saving you from awkward maneuvering and sketchy descents. Its design is complete with lightweight air-only internals featuring built-in compliance called ActiveRide(TM). It's like travel for your saddle. Enabled by SRAM AXS technology Reverb AXS XPLR is part of the ultimate personalized cockpit.27.2mm Reverb AXS XPLR delivers more control confidence and fun for gravelActiveRide - Air only internals provide a fully rigid top-out positionWith the touch of the required AXS Controller (AXS controller sold separately) you've got built-in compliance to ensure comfort and control over the roughest sections of gravelAXS Technology allows rider customization via the AXS Mobile App