Just got an Assioma UNO and test rode it today against my Gen 3 Stages L crank arm meter.
Good news is they tracked each other really well - except the Assioma is consistently reading 10W lower than my Stages L-only on same bike - same 10W +/- 1 W offset at all powers from 100-500W looking at durations from 20 sec to 20 mins. So unlike the typical problems where I see comparison of things like dual-side trainer power with drivetrain loss showing a few W difference, I’d expect better matching here. At lower wattages, this is well beyond 1-2% X 2 meters. At 500W, I wouldn’t worry about it.
I sprinted to make sure the pedal was well seated, and also verified the crank arm setting was correct. I could not find anything in the BOLT/ELEMNT software to override the Assioma setting either, so I assume that what I put in the Assioma app is what carries through?
Both were zeroed and re-zeroed. Tested it a couple times outdoors, and then indoors on trainer in ERG mode - consistently saw 10W +/- 1-2 watts depending on the selection period.
So, this is sort of good in that 10W offset is an easy value to work with mentally, but a bit disappointing in that I only see a % slope that I can apply in the Favero app - which would only be accurate for one power if I use it to correct this gap, and big enough to not be trivial.
It wasn’t completely clear if doing the static weight calibration could potentially rectify this - the app made it sound like this could help correct a constant offset, but one PDF I found showing the procedure made it sound like this may also end up just being a % slope change as well.
Anyone else run into this and are there any other tricks to put in a fixed wattage offset so I can match it to my stages meter and keep my data more in sync with existing data?