Originally Posted by ElJamoquio
I don't know about your meter, but PowerMeters use strain gauges and RPM.
Power is constant across gear/chain/belt connected shafts (neglecting friction), so you can measure the RPM and torque anywhere - at the ring gear, at the cassette/hub of the wheel, or at the trainer. Multiply the torque and the shaft speed and you have power.
Your sig is uncannily appropriate.
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Bring the pain.