I watched Stage 6 of the virtual TdF run on Zwift. Ineos' team included Froome - the video of him on the bike/trainer was pretty spectacular - in the shade of a tree with a phenomenally attractive background. But it was totally apparent that he was running non-round chainrings. Actually, pretty extreme non-roundness. Now, maybe this is what he rode pre-crash, or maybe this is some compensatory effort to adapt to any residual effects of his injury.

More importantly (and more generally - I don't care about Froome in the vTdF, or the vTdF overall b/c the charity and novelty/experiment aspect of this event clearly trumped the accuracy and fairness components)...do non-round chainrings provide any advantage/disadvantage in Zwift? Which is another way of asking how individual, controllable trainers/bikes 'handle' non-round chainrings. My guess is that this is known (certainly should be known by the trainer manufacturers, at least for commercially available non-round chainrings).

Just probing the ST hive mind about this and if there *could be* a way to design a chainring that provides some advantage in power reporting... Just to be clear, I'm NOT implying anything negative about Froome, just opening the discussion of the power reported by non-round vs round chainrings from Zwift-compatible trainers (and power meters, I suppose, such as pedal-based or other systems).