Have moovit speed and cadence sensors on dumb trainer. Both paired with Zwift and with bike computer. Bike computer shows consistent 25kph which feels about right compared with cycling outside for effort levels. But Zwift shows anything from 5kph to 39kph almost randomly. Any ideas what I’m doing…

Your bike computer is probably picking the speed up from the speed sensor on your bike which does actually measure speed the same indoors as when you’re riding outside, it’s based on the speed that the wheel rotates, zwift uses some fancy formulae that includes weight and other things that have noth…

[image] Mark: But Zwift shows anything from 5kph to 39kph almost randomly Your bike computer and dumb trainer don’t react to changes in elevation in Zwift. If you go uphill the avatar will slow down, your trainer wont change resistance like a smart trainer would, so you might just keep the ex…

[image] How Does Zwift Determine My Speed? it’s just totally demotivating and random. And the randomness means I can’t even compete with my yesterday time. Hi Mark, What do you mean it is random? There are elevation changes in Zwift, these aren’t random, they are part of the route. If you rid…

So my ride had 19m of elevation. Over 3km. Do these stats look right? [IMG_2804] [IMG_2803]

[IMG_2805] Sorry - wrong summary - this is my 3km 19m elevation.

Your speed doesn’t show anywhere on those screencaps, so we can’t tell if there were any random in-game speed changes. I think the power, cadence, and HR data a looks good, though. You might have seen your speed decrease when your cadence dropped, though.

[image] Nigel: I think the power, cadence, and HR data a looks good, though. You might have seen your speed decrease when your cadence dropped, though. You think!? 139bpm for 69 watts? Unless Mark was intentionally riding in his lowest gear something feels off to me. That being said, doing l…

Averaging 69 watts is very low power, you may need to check that you’ve installed the bike on the trainer correctly.

Ok - so I’m not going mad - I have lousy power. But how could the trainer setup affect my stats? The speed is coming through at 24kph on the computer while distracted by trying to figure out the app. My average speed outdoors on flattish roads is 27kph for similar bpm and perceived effort.

Speed on Zwift slower than bike computer?

Bugs and Support

Gerrie_Delport_ODZ (Gerrie) December 14, 2023, 1:01pm 4

See this nice little writeup: How Does Zwift Determine My Speed?

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Speed on Zwift slower than bike computer?

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