Giant Propel has an aero seatpost, and neither of three supllied Varia 'adapters' can fit onto it. So I designed and printed my own adapter. : r/bicycling
Original 1Set Bicycle Parts Cycle Seatpost Saddle Clamp For Giant TCR ADV Propel Seat Post Head
Giant Road Bike Seat Post – Cycling Kinetics
The new 2023 Giant Propel aims to be the ultimate full-aero all-rounder - Velo