SYSTM rolling off resistance when I’m below target?!

I had the same issue today attempting 14 Vice Grips, also on a first gen Tacx Flux.

I’ve lodged a support ticket, let’s see what happens.

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I tried tapers cadence was reading 120 no matter what I did, then power went to 0 wahoo kickr v5

Are you using BTLE or Ant+?

BTLE, using my iPhone 12 pro with iOS 15.

Power still not reading correctly today when attempting 14 Vice Grips again following recommended corrective action. Off to enjoy Zwift, at least that’s working for me.

To reiterate, my set-up worked perfectly prior to SUF transitioning to SYSTM.

Hey everyone, we’ve done some testing on our end with a Flux on the latest firmware, a BTLE connection, and Ant+ turned off as Tacx recommends if using the BTLE connection. We haven’t been able to reproduce this. This doesn’t mean that something isn’t happening, but that we can’t put our finger on it based on the information that we have on hand.

If you are still experiencing problems with your trainer and you haven’t contacted support, please do that. The more information they have, the better.

Hi Cody

I’ve got a ticket raised about this at the moment, although I’ve had to register a separate account on here as my Suff details don’t let me log in….

Not sure if it’s helpful or not but please see screenshot from a video of the issue. Even roughly hitting the cadence target the wattage seems to get stuck about 20 / 30 watts below target and nothing will ‘reset’ it to be working again.

Tacx Flux 2 - latest firmware
Devices it’s happened on:
iPhone on iOS 15
iPad on iOS 14.7.1

Support advice so far is to delete old Suff apps on both devices but I’m not sure how this will affect the issue as they are not running when I’ve experienced the issue.

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Hey, I have a Flux1 with 1x set up (36t + 11-44t), and this happens in the bigger cogs, esp with low cadence MAP intervals. Only workaround found so far is to shift up to the smaller cogs. There used to be an article buried somewhere on the TacX site, not sure where it is now, and Garmin support was of no help.

Hopefully this helps and enjoy the pain shakes.

Thanks for the input Erick. Sadly this issue has only happened for me since the SYSTM update.

I use the little ring half way up for ease for ERG mode. I did actually try the big ring too to see if it prevented the issue happening but it didn’t.

I’m tempted to get a free trial on another app to see if there are any ERG mode issues as could then narrow it down to being a trainer or app problem.

My ticket is still outstanding.

Response from support a few days ago was there is a known issue with iOS devices and that I should try SYSTM on a Mac or PC.

I put SYSTM on my MacBook Air and had same issue.

I’ve cancelled my membership as I’m not paying for something that doesn’t work. I’ll rejoin if and when the issues are resolved.

My support ticket went through the usual motions of power cycling the trainer (like I wouldn’t have tried that already), performing a spindown, unpairing all other devices, closing all apps, etc. Really anything other than admit they might have introduced a problem with their app update as it worked perfectly fine two weeks ago.

It sounds like you got more useful responses than I did by them admitting there was a known issue with iOS devices but as you say it happens on Mac too and I’m not really in a position to run it on a PC to try that.

Lost patience and cancelled my subscription too. Joined TR instead which seems to work perfectly. I’ll miss the videos and the humour but at least I can do a workout now.


The problem is still there. The SYSTM app alway try to go -20 Watts below power target. I increase the gear to help it, and after the peak power, inmediately return to -20 Watts. Check the photo clips. Thanks to this error I almost end 9 Hammers with no rest :slight_smile:
Setup: iPhone 7 Plus, iOS 15.0.1, Tacx Flux 2. Never happened this with SUFF.


Hi Wahoo Team

Is there any update on this issue?

Thank you

Did Lac de Cap de Long this morning - M1 w Garmin Ant+ dongle Flux 1, near middle of rear cassette- MAP AND AC targets did hold.

I did have problems in the past with the trainer not hitting the targets using BT in the old SUF app - I’m thinking it’s something with the firmware?

Hi Wahoo team, any update on this issue? I have the same problem with my Tacx Flux and IPhone. Have tried firmware update etc but no change. Please advise as am losing patience. Thanks

Any update on this? I’ve been experiencing the same issue with a Tacx Flux (early edition) running the app on an iPhone 12.

I discovered today if I turn off power smoothing and run at the smaller end of the cassette there’s less variation but trying to do the Cure today and I could feel the resistance changing frequently throughout the 20 second sets with power readings oscillating between 120 and 350. This wasn’t an issue on the old app, and I’ve only experienced these issues since moving to Systm.

My wife is running an Elite Direto with no issue, so I’m thinking its related to the trainer.

Is the resistance sort of dropping off then back on again at regular intervals?

I don’t know if I’d say regular, but its certainly not holding a consistant resistance throughout the set. It will hold momentarily, drop right down and then surge back over the required effort before dropping again.

I was noticing the higher the output, the larger the discrepency.

OK this sounds like what mine is doing. I have a ticket in for this. Will let you know if I hear back. Worth you raising a ticket with the Minions also.

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Same here. Minions informed. No solution as yet :frowning: