I have 2 general questions about using external power meters with Zwift. I’m totally new to external power sources, so apologies if these are silly questions:
Power discrepancies between Kickr and power meter
I have recorded several several activities, using the Wahoo Kickr Snap as both the controllable and power source connected to Zwift, but I also recorded that same activity with my garmin that’s reading the power from the power meter… to be able to compare. In all cases, the power readings are very different, sometimes even 30w difference… with the power meter readings always being higher than the Kickr one.
Note: I did calibrate the pedals, but I didn’t perform a spin down on the trainer.
Is this normal to happen, like such big differences? Is spin down THAT necessary to get more aligned power readings, or is there something funky? I’m thinking on using the pedals as the single source of truth, but not sure if that’s the right approach.
Power meter oscillations
Again, I’m totally new to external power meters, so not sure if this is “normal”. I did interval work, over/unders to be specific, and this is what I got:
As you can see the Kickr Snap is what I would expect, clearly defined power sections. While the power pedals are full of oscillations/spikes. If you squint your eyes, you kind of see the underlying intervals, but still… full of oscillations. Torque effectiveness and pedal smoothness all within normal values. So not sure… if this normal?
- Kickr Snap
- Favero Assioma Duo
- Activity recording: ERG mode, Kickr as both power source and controllable, but recording same activity with my Garmin (which reads the power meter pedals)