First up - here’s my setup:
- Tacx Neo with latest firmware
- Zwift on Mac with Ant+ dongle
- Stages power meter - latest firmware
- Garmin Edge 820 - latest firmware
When doing workouts, I get very different readings from my Stages power meter - paired to the Garmin - than the Tacx/Zwift setup. But only when I get above 200 watts.
I can ride a recovery part of a workout for two minutes and hit exactly the same numbers on the Garmin and on Zwift. But as soon as an interval kicks in (ex. 3 min @ 350 watt) the Garmin shows 30-40 watts lower average power than Zwift/Neo. Could this be how ERG-mode affects my pedal stroke? Or is there any other possible issues? Just got a new Stages arm. My old one had same problem.
The image with the lowest average power is the Stages. The higher number is the Zwift/Neo.