My Zwift running set up makes use of my Stryd foot pod as a speed / cadence sensor.
My Garmin Fenix 5X Plus also makes use of Stryd for when I select “Treadmill Run” as a new activity.
I’m therefore a little baffled as to why when measuring the same run using both methods (as described above) the Zwift measurement is appreciably slower. They each use the same (Stryd) sensor! By way of an example, a recent 6k (treadmill) run was measured by Zwift at a pace (in min / km) of 4:10 / km but the Garmin’s pace was 4:00 / km. These paces translate to around 14.4 kph and 15 kph respectively and for what it’s worth, the latter is closer to the speed shown on the treadmill.
Any ideas why these two measurements are so different when using the EXACT SAME measurement device for the EXACT SAME run?