WHAT IS POWER?
Simply stated Power is the amount of force (or work) produced over a certain duration of time. A power meter, like the PowerTap hub, takes the torque produced by your pedaling and multiplies it by your speed.
HOW ACCURATE ARE POWERTAP POWER METERS?
The PowerTap is one of only two power meter companies, which has been scientifically researched and 3rd party validated by Allen Lim (co-founder of Skratch Labs) and other researchers at the University of Boulder – Colorado. They tested the reliability and dependability of the hub and found it to be +/- 1.5% accurate, time and time again. The PowerTap pedal and chainring power meters are validated by comparing with a PowerTap hub, and have been proven to show the same amount of accuracy and consistency, +/- 1.5%.