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Old 05-03-17, 11:10 AM
  #34  
laf
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Originally Posted by Kopsis
I suspect the PM isn't actually reading lower, but that what you're seeing is the effect of measurement noise. Unlike the trainer where resistance is smooth and controlled, on the road there is lots of irregularity. The momentum of your legs will carry you through much of that without really even feeling it, but the effect is lots of little spikes (both up and down) in the power curve.

So if you're looking at your "max" for anything less than 3s averaged power numbers (and the fact that you say you see this in just a few pedal strokes tells me that's the case), the differences are "real" but meaningless. Set your computer to show you 10s averaged power and I it's likely the trainer and road "10s max" will match nicely. I never display anything less than 3s average on the road because below that the numbers bounce around too much to be of any use.
My powermeter is at 3s average power. The readings inside are lower inside no matter what Im doing.
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