Stages vs Powertap differences
Lactate threshold – 55W or 32%
FTP – 38W or 13%
Both are significant enough to render any comparison to Friel’s table utterly useless. I suspect it’d down to left leg dominance which is interesting as 2 years ago the musculature of my right leg was visibly more than my left. 2 years of riding to power numbers has (I surmise) trained my left leg to overtake my right – it looks the same now.
Stages is still right for me – I no longer care about comparisons (they don’t win anything) and it is excellent for training and pacing and carries no weight penalty. I have one on my riding bike which can swap between triple, 1x and single speed with ease and one on my turbo.