Bike Computer Mount Camera Holder for 2018 GIANT Propel Tiger for GARMIN WAHOO | eBay
Fouriers Bike Computer Mount S024 For 2018 Giant Propel Per Garmin Wahoo Mio Bryton - Bicycle Handlebar - AliExpress
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