It is a 30.9.
Rockshox Reverb AXS Dropper Seatpost 34.9mm x 170mm
Rockshox Reverb AXS Dropper Remote Controller Left Hand
Rockshox Reverb AXS A2 - 170mm dropper seatpost, 34.9mm dia, boxed complete.
Rockshox Reverb AXS Electronic Dropper Post 34.9 170mm A1
RockShox Reverb AXS B2 Dropper Seatpost (Drop & Diameter Option) - Wireless
VELYN 500mAh Replacement Battery for SRAM AXS, USB-C Rechargeable Bike Battery with 4-LED Power Indicator, Fits eTap, Eagle, Red, Force, Rival, GX, XX1, X01, Reverb AXS Dropper
