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Speed when connecting to indoor trainer as power meter

Hi,

I am doing Indoor Cycling using a smart trainer. I connect this smart trainer as a power meter to my Forerunnter 945. I am a bit confused of the speed/distance that the watch is calculating based on the power:

The data of my last two trainings:

2nd May: the average power was 151 Watts. The watch calculated an average speed of 28,1 km/h.

29th April: the average power was 138 Watts. The watch calculated an average speed of 31,9 km/h.

How can the speed on 2nd May be faster with 13 Watts less?

What's your experience with the calulcation methods Garmin seems to be using?

Kind regards, Kai

0 BeneGi over 5 years ago

How do you control the smart trainier? Usual use case would be something like Zwift. If so, the ride on the 29th April had less climbs?

0 Dr Phil over 5 years ago

https://www.garmin.com/en-US/blog/fitness/tips-for-training-in-erg-mode/

https://support.trainerroad.com/hc/en-us/articles/201869764-Erg-Mode-Explained

0 mcalista over 5 years ago

The reported "speed" will depend on which gear you are in.

If you are in the big ring, the trainer axle rotation (and "speed" will be much faster than if you are in a low gear on the small ring, even if the power is the same.