Power On Karoo 2 Alway Higher Than Garmin Fenix 5 Plus
Hi,
I have gotten in the habit of always dual recording my rides on the Karoo 2 and my Garmin Fenix 5 Plus watch, just because until recently the Karoo hasn't been super reliable, and also I was getting used to it. It also frequently lost sensor connections, though that seems to have improved with recent updates.
Then I started noticing that my average power reported by Karoo 2 was always around 10 watts or so higher than what was reported by my Garmin at the end. Maybe I didn't pay attention until now because I would sync the Garmin recorded ride to other platforms and leave the Karoo ride on the Karoo site, and the Karoo site doesn't report any summary metrics. But recently I included average power as a data field on the Karoo Itself and started noticing this. Both are using the exact same power meter (Quarq DZero built in to SRAM Force AXS crankset). This power meter needs no calibration as it auto-zeroes.
I then downloaded both fit files to https://matandoocorpo.github.io/fit2compare/ and although the overall shape of the power graph looks similar, I can see lots of places where the Karoo is reading a power reading where the Garmin is reading 0, just generally the Karoo seems to be ahead of the Garmin a bit and generally a bit higher readings.
Is this something that can be analyzed by the Karoo team to see which is more likely to be "correct". I understand both will have their own quirks with Auto-Pause (both set to 2mph), but this is quite a large difference from the same power meter. Would it be worth triple recording for comparison, since I also have my older Garmin Edge 530 lying around?
Thanks.
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Saad
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I always duel record to my Polar watch (and trippel record earlier with my Garmin 520) never had more then a 1-2 Watts in different, often because that I doesn't start/stop them at the same time.
I use shimano PM or Garmin Vector 3 power meter. No auto pause and always Ant+, never Bluetooth.Question, are you using Ant+ on both devices?
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Also average is one thing, but looking at the shape of the power graph there appear to be quite a few discrepancies, which is surprising for the same power meter. I've read different platforms have a different definition of average, but if its the same power meter shouldn't the shape be identical where both are getting power values? If there were some small areas where one wasn't getting anything at all, like differences in sensor connection status, that would be one thing, though not ideal.
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I should try to do some rides without auto pause.
And also look this setting at both device
https://support.hammerhead.io/hc/en-us/articles/360058001633-Zero-Averaging-your-Power-and-Cadence-data -
Hmm, on my Karoo I have it set to include 0's in power, can't find the same setting at all in my Fenix 5 Plus. Although my older Edge 530 does have this setting. In any case I thought that only affected the average power it puts in the fit file itself. But it shouldn't affect the actual power values recorded for which I'm seeing discrepancies in the graph of power values between the two.
Strava seems to compute its own average anyway from the underlying power values in the fit file, and the average it displays is even lower than what Garmin claims by a bit.
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Saad
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Saad
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