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@Smallfurry
Not in theory.
SRM has 8 (I think) tensionmeters in the spider. ie. between chainrings and crank arms.
Stages has a tensionmeter (more than 1?) in the non driveside crank arm. It then assumes right power = left power. To calculate total power.
But it is very well priced, light, and a piece of piss to install. If they did anything in a 165mm, preferably a Rotor. I would have jumped on it I reckon. Although the P2M is not that much more expensive.