Hello, I just got a Stages left-side-only power meter after I’ve been using TR with virtual power for the past 5 months or so. I’ve noticed a lot of previous topics where people were describing virtual power as being something pretty large like 30 watts off compared to a power meter but overall pretty even. What I’ve noticed after one TR ride where I used virtual power on the computer (cycleops Fluid2 trainer) and the stages power on my garmin head unit was a pretty weird looking power band like this:
VP FTP 180
90w VP vs 40w Stages
170w VP vs 165w Stages
275w VP vs 310+w Stages
It seems like on really light spins, stages is showing nearly half the watts of virtual power. At or around my FTP (140w-200w or so) it seems consistent enough. It tends to be roughly ±10w. At well above, starting by say 120% of FTP and certainly by 150% the Stages is showing way more than virtual power.
Is this normal expected behavior of either a left-side only power meter or virtual power to have a weird curve like this?