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@EdwardZ
Why Rotor cranks? The chainrings are not good science. Not much more than the nth take on non-round rings--- which have been tried off-and-on for a century--- they are more POS as "power of suggestion" than "power of science" (or to misquote Ed Burke, the father of American blood doping, "success through science") . Most of the research I've seen seems to point in the same direction on elliptical chainrings: they don't really work (and may even be counterproductive) in "real life". I won't try to contest that they may, at first, appear to "feel better".. or even that they might not deliver a placebo effect on rejeneration to some riders.. But.. like homöopathie.. they just seem to be expensive...