Hi. I recently swapped my Tacx Neo Smart bike for a Zwift ride (frame + Kickr Core + Cog) and have been testing it’s power accuracy compared to my Favero Assioma Duos using the DC Rainmaker analyzer tool.
I’ve found some interesting results and was wondering if anyone has experienced this as well or can help me?
Test #1
Out of the box, the trainer was reading about 8% too high, and then I did a factory spindown and I started seeing good numbers. However, mid ride I coasted for a while to trigger an auto calibration, and then I noticed the number were off 4-5%. See results:
Accuracy BEFORE auto-calibration +1.08%
Accuracy AFTER auto-calibration +4.38%
Test #2
I started questioning my reality and I wasn’t sure if my power meter was off or the Kick Core, so I borrowed my friend’s Assioma Duos and repeated the exact same test, with very similar results. Step 1) Factory Spindown, 2) Start Zwift workout and note accurate results, 3) Coast mid ride triggering auto-calbration 4) Continue workout and note the power is high by 6% in the Kickr Core:
Accuracy BEFORE auto-calibration +1.80%
Accuracy AFTER auto-calibration +6.56%
Test #3
I haven’t been able to recreate this issue when using the Wahoo app in either passive or Erg mode. See this analysis I did and sent to Wahoo Support (they haven’t gotten back to me yet):
Accuracy: +1.88%
Here is the workout I used for Test #1 and #2 (in intervals.icu workout builder format):
2x
- 5m freeride
- 1m30s 150W
- 30s freeride
- 1m30s 200W
- 30s freeride
- 1m30s 250W
- 30s freeride
- 1m30s 300W
- 30s freeride
- 1m30s 350W
Trigger an auto-calibration between sets by coasting
