Originally Posted by
mschwett
power meters measure the force applied at the pedal, crank arm, or crank spindle. that combined with the rotational speed of the crank is power. they do not measure anything else at all - not even speed. certainly not direction or wind!
in the 80s... from what I read anyway.
now they use gps, accelerometers, a pitot tube, temperature sensor, barometer, e.t.c.