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I remember reading both DCR and GPLlama having the same issue of single digit % off, in their case too high.
Would expect Rotor to have a fix, see what they say, or just redo with a few crank lengths. I remember forgetting to reset my Vectors with the right crank length and busting out great FTP tests only to brought back to earth...
onyerbike
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?