The results are shown for 5 brands below: QUARQ DZERO, Rotor 2INPOWER, SRM Origin, P2MAX NG, VERVE infocrank
Comparison of sensors with each other
We note that for the
chosen reference (Verve), the 2nd sensor does not seem to deliver the same measurement. The other sensors followed a
different slope with the increase in intensity. The test unfortunately does not indicate how the tolerance of each sensor evolves by multiplying the tests.
In the other models tested, the Vectors 2 are One reference recalibrated. We know that
measurement accuracy depends a lot on the tightening torque and the
associated tedious calibration. Quite the opposite of the Powertap P1, which is very easy to install and delivers reliable measurements.
Vector 2 failed, Powertap P1 deemed very One reference accurate.
The worst sensor remains Stages deemed
unsuitable for its primary function of power measurement…
The bench also offered temperature change whatsapp number list simulations
with a rapid variation of 15 degrees. Quarq, despite good
results in the comparison, did not pass the test, dropping 20 watts in its
measurements despite the strain gauges compensating for temperature changes.
Another study available here , also done on a treadmill, is the one
carried out by A. Bouillod for the FFC. He
compared SRM, Powertap, Vector 2 and Stages
at different levels of intensity and cadence. The reference chosen was the SRM.
Measurement accuracy, differences depending on sensors and intensity/cadence
As we can see, Powertap evolves in a range
of +/- 3% (10 w) around the SRM, Vector 2 underestimates a little more at times
and it is especially Stages which mark time spy benchmark results completely goes outside the admissible tolerance for
training with power with at times differences of 60
watts!
As highlighted by Tour Int and the
temperature change, nothing replaces field tests to be sure of the accuracy of a
power meter. Smoothing out pedal strokes on treadmills or indoor trainers can reduce the
differences between sensors. It is therefore also necessary to validate sensors betting email list in the field, even if
it is less easy. Vibrations, constant variations in intensity, and outdoor temperatures make calculations much more complex and can lead to surprises compared to indoor results.