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If we're thinking of the same thing, it was in the last 2 or 3 years, and wasn't so much a 'science report that suggests participants in an experiment couldn't tell the difference between different bike frame materials' more of a 'different frame materials didn't make a huge amount of difference time-wise to someone's commute'.
Somewhat unhelpfully, A) I'm struggling to pinpoint it and B) You may have something different in mind. -
There's a US magazine test from the 90s that had someone build a bunch of identical-looking frames from various Reynolds/Columbus/etc tubesets and had them test-ridden with the riders unable to distinguish between them. I can't for the life of me remember where I saw it though - I think it was on the author's website, which was 1996-vintage plain HTML.
Does anyone have a link to the science report that suggests participants in an experiment couldn't tell the difference between different bike frame materials? Cheers