TribesMan wrote: ↑Wed Dec 15, 2021 1:19 pm
Maddie wrote: ↑Wed Dec 15, 2021 11:56 am
Indeed. The Direto is a perfect example for sending out products to reviewers with adapted firmware or hardware that is not publically available. I have one and my experience is pretty different to all the positive reviews...
It is not very good practice to compare any real power meter to a trainer, which does not have a real power meter inside.
All trainers that are calibrated by "spin down" procedure are only "power estimators".
There is no power measurement going inside there.
There is a lot of factors that influence power estimation given by a trainer, like ambient temperature, warmup time of the trainer, flywheel speed, power...
Elite is known to do some "optimization" of firmware, to improve the accuracy of their trainers, which are usually very far off from the promised +-2% from the factory.
I own a Suito and when I compared it to my Assiomas I found out it is extremely inaccurate.
Just to be clear, when I compared Assiomas to Wahoo Kickr, they were spot on +-1%.
When I presented my findings to Elite, they offered me to "adjust" the trainer, by me performing some specific intervals of riding at set intensity levels and flywheel speeds. And recording power from Suito and Assiomas at the same time.
After sending them the data, I got a .json file, which I uploaded to my trainer.
It improved things in some areas, and made it worse in others.
After repeating this procedure twice and when things were clearly not improving, I performed my test ride again...
It included 4 sets of intervals from 100-600W at different flywheel speeds (25, 15, 45 and 35kph).
This is the comparison of Suito vs Assioma pedals (after firmware adjustment by Elite):
https://zwiftpower.com/analysis.php?set_id=184839
And for more clear representation I also made a comparison in table, to show how flywheel speed influences the accuracy of the Suito.
SuitovsAssioma.png
Suito can read up to 15% too low at slow flywheel speeds and up to 15% too high at high flywheel speeds.
It is somewhat "ok" around 30kph and up to 250W... but everywhere else it is way off.
Basically, the Suito is more like randon number generator than anything else.
So it is very unfair to compare any real strain gauge based power meter to any trainer without prior validation of the trainer with some other device.
Ecxept maybe Tacx Neo or Wahoo Kickr, those two I think are very accurate and don't require any spin down anyway.