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skinny-
The difference is consistent - always 4%. Without lab testing you couldn't claim the Vectors or the Rotor were telling the truth... maybe they're both wrong. Either way it doesn't really matter, I just want it to read the same as my Kickr.
Also, the Inpower was second hand on ebay for a steal, I doubt Rotor would be much help.
danb
dbr
My Rotor Inpower reads 4% lower than @cjr 's Garmin Vector 3, and my Kickr (once it's warmed up). I can adjust the crank length in my head unit, which should affect the relative power displayed - should I make the cranks longer or shorter to give 4% higher reading?