Power Drift (Kickr on Trainerroad vs Garmin reading Stages Power)

I’ve had Kickr 2017 + Stages left-only power meter for a year now and it has generally worked well using:

  • Kickr power only (Stages as cadence)
  • Kickr with TrainerRoad PowerMatch (so that inside and outside power readings match)
  • Kickr with “Control with ANT+” (Wahoo’s version of PowerMatch)

I’m using TR on iPhone, so Kickr and Stages are connected via Bluetooth.

On Sunday I finished upgrading to Stages LR and also replaced pedals. Was on the road for 5 hours yesterday, and did a short trainer ride to “settle in” the pedals and PM. The “Eclipse” workout was on my calendar and I only did one interval. It felt a lot harder than usual on a 94% interval, like I was at threshold and not sweet spot. Hmm…

Like you I was dual recording with Edge 520 and TrainerRoad app (using Control with ANT+ option from above). During the sweet spot interval the Edge 520 was reporting ~15W higher than TR app. Sure enough, after uploading both to DCRainmaker’s analyze tool I could clearly see the difference.

After ending that 35 minute shake down ride, used Wahoo app to do a spindown and then an advanced spindown. Using Stages app did yet another zero reset. Then a 2 minute and 1 minute test where it was within a couple watts.

Going to ride tonight and if same thing happens, will disable “Control with ANT+” and go back to using TR’s PowerMatch. Theoretically the Stages left pedal is transmitting total power to TR over Bluetooth, so it should work just fine (as in the past, before upgrading to Stages LR).

Both Stages “Control with ANT+” and TR’s PowerMatch should result in using Stages for power both inside and outside. I’m a little surprised that “Control with ANT+” wasn’t working well yesterday, given I’ve been using it for the last month. The good news is that TR wasn’t involved its just the Kickr and Stages so I can pursue resolution directly with Wahoo if it happens again tonight.