Zwift Hub on Garmin Tacxe


When I use the Garmin Tacx with the Zwift Hub, the speed value seems much lower than my normal one. For example, with a slope of 0 % and at 200 W on Zwift I have a speed of 36 km/h and on Tacx only 25 km/h. Why is there such a difference? Shouldn’t it be the same or very close?

Yes, but it’s very different. Even in real life, I have much higher speed results.