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f4rrest I take it, from the color, that's Kurt's published power curve? For the record, TrainerRoad say their power curve matches up very nicely to Powertap tests they've done as well:
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In our unscientific tests with our PowerTaps and Kurt Kinetic Road Machines we were within 3 avg watts for our intervals...so pretty darn accurate. You can get a run down on the Kurt Kinetic Virtual Power Curve here."
I don't quite understand what the basis is for reasonable skepticism of "web power curves" either... unless the same gross level of discernment that is suggested by "web power curves" indicates a similar kind of sloppiness in reading and understanding what the charts say.