No dynamic resistance with Tacx Flux S in Zwift

Hello everyone,

I am new in this forum and also new at Zwift. Sorry also for my written English :sweat_smile:
The main Problem is during the drive with my Tacx Flux S. When I drive up a hill the Flux doesn’t change the resistance. At the App from Tacx is all fine.
The second Problem is the calibration. It fails every time. At the Tacx App the calibration has success.

If anyone have an idea I will be very grateful.

Greetings from Germany!

Hi @Yannick_Dierkes, welcome to Zwift and your English is fine :slight_smile:

In the early days with my setup I had problems and it was solved by

  1. Setting up with Trax to do the calibration
  2. Deleting the Trax pairing
  3. Using Zwift, it sorted out the pairing (sort of)

However, don’t waste your time with Bluetooth get an ANT+ dongle after this Zwift and Trax worked together just fine. Until I had Ant+ like you I found Zwift wasn’t great. Now I have it Zwift is brilliant fun :slight_smile:

That is until there is an event important to you, then you arrive almost late to find a Zwift update, which takes a while, pairing also, resulting in you finally get into Zwift a few seconds too late :frowning:

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Thank you for your answer.
I already tried it in this way. By the way I have also an Ant+ Dongle :wink:

Do you have another idea?

Do you use windows or Mac.

when you pair your should pair it as Powersource and Controllable using the ANT+ FE-c option.

See if these link helps.
https://zwift.com/uk/video/how-to-cycling/pairing-smart-trainer

Sorry no but I hope @Gerrie_Delport has helped, you are in good hands with him.

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Hi Yannick, everyone,

I’m having the same problem since I have switched to Apple TV (coincidence, I don’t know).

So as mentioned before:

  • there is no dynamic resistance changes (going uphill vs downhill vs flat vs drafting)
  • tried to restart and uninstall all software/apps and also restarting the trainer
  • previously when I have started with Zwift I was using WIN10 on my laptop and was communicating via Bluetooth - everything was good
  • all devices are paired with Zwift
  • even on Apple TV (which has limited number of Bluetooth ‘ports’) my smart trainer and HRM strap are well connected and responding, except the resistance change - which is also shown as paired
  • I have also tried to pair everything on Apple TV via Zwift Companion app - same result - all works nice except resistance responsiveness
  • all settings (e.g. trainer difficulty and others are set up correctly)
  • the thing is that even if I try to connect Zwift via mobile (so the Zwift app is running only on my mobile) the resistance is not responsive
  • I have installed Tacx software and also ROUVY to check if my Tacx Flux S is working correctly - on both apps it works perfectly - so when I’m climbing I feel the change in the resistance etc.

I don’t want to play with ANT+ as Bluetooth was working very well and it works with other apps. Moreover if the app and trainer support Bluetooth - it should work on Bluetooth.

Is there any solution for that or I have to sign off from Zwift permanently and switch to other platform? :frowning:

(PS I would like to stay with Zwift as I was loving it so far)

/Rob