Wahoo have released a firmware update for KickR Core, KickR Move, and KickR V6 acknowledging the calibration issue.
Let’s see if it’s solved or if they introduced new issues 
Did firmware update plus spindown
Login to zwift. Wait a bit at start. 5 min tests of virtual shifter. No wattage jumps registered. Smooth ride
From my point of view it was fixed. However longer tests are definitely needed
After the update, the higher gears in virtual shifting seems easier…
I installed the firmware update and did a spindown 7 days ago. I didn’t help, today when riding down The Grade it took 10 seconds for the power to hit zero after I stopped pedalling… Power hovered between 5 W and 20 W.
Yes, for me unfortunately problem persist or rather strike back 
Its especially visible on high % climbs, like the Grade
After the firmware update, I still can’t use Super Tuck either. The wattages remain stuck between 10 and 20 watts.
Could a factory spin-down help?
have you both completed the Factory Spindown, and what was your brake factor after the process completed?
Do you get extra watts only on step climbs?
That is a known issue for some trainers and not ghost watts issue that was fixed with new firmware.
I dont even get extra watts. Its rather visual (?) Issue with power representation
My power graph is oscillating. Looks like every pedal push = teeth on power graph.
Sth like this on The Grade
Less visible on flat or lesser climbs. But still present. Straight after patch i thought it was fixed. No issues for like 5-6 different rides
Are you using Virtual Shifting in small front ring? This has been reported back in February by a few.
Some are using Big Front Ring and this issue is less noticable.
Checked small/big ring. Checked low/high rear gear. Checked low/high rpm
I think it has to do sth with starting autocalibration on wahoo kickr core
It was super weird, as for over a week everything was great. After patch and wahoo firmware update + spindown. No issues. Suddenly it broke. Last 3 rides oscillating all over the place
80km easy z1/z2 - problem
The grade kom race - problem
Hilly race - problem
So again im putting virtual shifter aside
I would suggest you go with this data directly to Wahoo Support…this is how Trainer reports power to Zwift and i don’t think it’s Zwift problem because the program only reports power that it gets from your trainer.
I agree this is a trainer problem
Sth with firmware and autocalibration would be my guess
Sorry for the late response. I did a factory spindown today. The braking factor was 0.96. Now the Super Tuck actually works and the watts remain at 0
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I can’t believe I’ve just found this thread. I’d searched before but couldn’t seem to find anyone with the same as me.
I started getting this issue (the oscillating power) with my old Kickr Core, having been using the virtual shifting fine for a few months. Tried loads of stuff and Wahoo got me to do some diagnostics, eventually pronouncing my Kickr Core faulty and offering a replacement. I had to ‘field retire’ my Core and have paid for a discounted refurbished Kickr V6 which I was very excited to set up. Had my first ride today and was devastated to see the exact same issue 
I wanted to keep things simple so am using the Zwift Cog, play controllers and wanted a virtual shifting setup. I was using the small front ring but now going to try the big ring and see if any difference. I don’t want to go back to manual shifting, especially since I removed the front derailleur!!
Hi Lewis,
Yep try the larger chainring. I don’t know how small your small chainring is, but the oscillations are due to low flywheel rpm and increased electromagnetic load to simulate resistance.
If you go with a larger front chainring, then the flywheel speed can be a few thousand RPM higher depending on your exact gear rations.
For reference the Zwift ride setup has a gear ratio of 3.0. So 90 rpm will get you 270 rpm at the pulley wheel and ~2,500 rpm at the flywheel on a V6.
Extreme example the other way if you use a 30t front and 50t rear, 90 rpm gets you 54 rpm at the pulley wheel and 500 rpm at the flywheel!. Then assume you ask for a gear ratio of 20+. The trainer has to apply some serious electromagnetic load to that flywheel.
These numbers seem a bit high
Pedalling at a cadence of 90rpm in a gear ratio of 3 will have the freehub and pulley wheel spinning at 270rpm.
I think the pulley wheel has a 9:1 ratio to the flywheel via the belt. You can check this by spinning the pulley when one revolution and counting the revolutions of the flywheel.
So at 90 cadence, you have 270 at the back and then 270x9 at the flywheel, pretty much 2500rpm
It’s actually 7:1.
Seven rotations of the flywheel and one rotation of the big belt wheel.
I just counted it myself at my Kicker Core.
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