Virtual Shifting - Watt decrease w/o reason :-(

Bugs and Support
1

Dear forum,

I have the following problem: On a Kickr Core with virtual gear shifting, the watts decrease despite the same gear, the same incline and the same speed. What is the reason for this and does anyone else have similar problems? Its really annoying and difficult especially during a hard sweetspot intervall to keep the aimed watts :-(.

Thank you and best regards
Günter

2

Hi @Guenter,

Welcome back to Forums! I am Nelson from Zwift Support.

I reviewed your account and found that a Zwift Hub is paired with the game instead of the Wahoo KICKR CORE. I found a lot of Bluetooth disconnections from your devices, especially the Zwift Hub. This can cause the resistance and the watts displayed in the game to be inaccurate.

Please note that the usual cause for Bluetooth dropouts is wireless signal interference. Check out this article​ for other common reasons and tips on how to prevent this from occurring.

Don’t hesitate to contact us at Zwift Support if you need any further assistance. We will be there for you.

3

dear nelson, thanks a lot for your fast answer!
of course u are right - its a zwift hub…my fault :face_with_hand_over_mouth:.
Since the beginning I had the impression, that my laptop loses the BT connections. Usually I have connected:

  • the zwift hub
  • cadence sensor
  • headphones
  • virtual shifting
  • heartrate sensor

the distance is about max. 1,5m between hub and laptop. ntl I will try to move my fan and maybe use an external BT antenna.

kr
Günter

4

I’ve updated my setup incl. external BLE adapter. Problem still exists. Maybe I haven’t explained it well:

  1. Drive a mountain with 10%. Gear 20(!). RPM around 90. Watt drop from ~260 to 200 and fluctuating. Even shifting to 22 (independend of the choosen chain set) doesn’t feel real. Its NOT going to 0. Its simply not realistic at all and jumping.

Its very frustrating and mentally difficult to keep the power on the right level without ERG and its definitely not “normal”, that power decreases on a mountain (in reality). So what is wrong here?

I hope you get me right now :-).

5

Hi @Guenter,
Did you manage to solve this? I am having the exact same issue with a brand new Wahoo Kickr Core2 with the Zwift cog. I can’t use Zwift like this at all :frowning:

6

Hi Piter,

I bought an external BT antenna. It seems to be be more stable in general now. Ntl to be honest I used ERG for the 30/30s intervalls recently. But I will try this week manually and see if its working…

It is really annoying because its the opposit of “smart” - less “strenght” on the same steep, speed, cadence doesn’t make sense… and as the intervalls are already mentally hard thus makes it impossible.

kr Günter