A single sided Power Meter… you can measure wattage with just the left crank arm?
That can’t work… can it?
Using only one crankarm to measure can and does work to accurately measure power and cadence – I’ve been training indoors on a FreeMotion S11.0 Indoor Cycle with power for over a year. And the club where I teach has been offering Power based indoor cycling classes for just as long.
The beauty of the $699.00 Stages Power Meter is that it works with any Ant+ enabled device, so you can connect it to your Garmin or iPhone if you have a Wahoo Ant+ dongle.