DC Rainmaker who once said «science sucks» did some «Treadmill Accuracy Testing Fun» in the following video: this is the title of the above review. And fellnr uses a high speed video camera and the Kinovea software for treadmill calibration: https://fellrnr.com/wiki/Treadmill_Calibration Christian Galeffi has built a Raspberry Pi treadmill sensor: https://gallochri.com/2020/05/universal-treadmill-speed-sensor-for-zwift-with-ant-stick-and-raspberry-pi/ But then he sends …