ZwiftHub + Garmin Fenix 6 - flaky Connection

Hey there,

just tried my new ZwiftHub Smart Trainer in combination with my Garmin Fenix 6x Watch and 125W ERG Mode. It seems the connection between the Trainer and the Watch is rather flaky - one can see that Power Metrics often drop to 0W even I was constantly driving the ~125W.

Are there any known Problems?


noone any idea?! :frowning:

Anyone with a Fenix 6X here who could try if this also happens with other ZwiftHub / Fenix?

another try today with ZwiftHub + Fenix 6X … massive drops on Power Graph :-/

but no drops on Cadence - so it’s not connection problem but something with the Power Data transmitted to Fenix?!?

Just to clarify, you are using your Fenix to do workouts (i.e. ZwiftHub <–> Fenix) and not Zwift? It looks like it’s getting worse.

Have you tried using your ZwiftHub with Zwift and if so, what were the results? If you tried it on a PC or Mac, it would be interesting to see results to see what’s happening with sensors and packets.

exactly - ZwiftHub <–> Fenix 6X in this case. (Easy ERG-Based Recovery Training with Netflix on the TV and not Zwift App)

ZwiftHub in Combination with Zwift is working fine - this is the Power Reading within Garmin Connect, 3 days old, when Data is directly transferred from Zwift to Garmin:

It seems it’s some sort of problem when ZwiftHub is transferring Power Data directly to another Device - Fenix 6X in this case … :thinking:

Right, makes sense. I do a lot of Z2 and minimise Zwift and watch movies so I might give this a try.

I just read through the comments on this DC Rainmaker article and a few people had the same symptoms and a lot of people had no issues.

The few people with the same symptoms also had the trainer paired to something else so signal were competing for control of power and tbh, your power graph looks exactly like two things are trying to control it. Do you have the ZwiftHub app open on your phone, Zwift on in the background (or Companion if you pair to Zwift via that)?

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Good point about the possible competing connections. Today I had the Zwift app running in the background because I wanted to compare the Zwift / Garmin recording.
But I think the first time only the Garmin was running, but I’m not 100% sure.
Will do a test tomorrow where definitely only the Garmin is running and nothing else and then we’ll see if that could be it… thanks for that hint! :slight_smile:

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I get similar issues but for heart rate tracking, (1) trying to use my Fenix 7 indoor bike activity, paired to Zwift Hub and get a zero heart rate reading. (2) Broadcast fenix 7 heart rate to zwift app but then the reading is incorrect and static (stays at 80 for example).

today I tried it with my Fenix 6X as only Device connected. But still some drops in Power Data! :frowning:
(but way less than last time)