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You sure it's not just you tired/powerful legs?
What is it's calibration value? Is it within the correct range?
The acceptable range is 500-524
http://www.cyclepowermeters.com/powertap-garmin-calibration-check-76-c.asp
hippy
@NotThamesWater
If one of my Powertaps is reading 20W below what I would expect (although I'm still to do a proper calibration test with a known weight), what are my options?