• Tube diameters/thickness, weight compared side-by-side with a frame with virtually identical geometry and construction in a supposedly heavier tubeset (assuming the lugs /dropouts aren't made of dark matter).

    Since I've got it and had a closer look, there are a few examples online that are identically built to this one (lugs, stays , panto style / location) that are a few models down from what was described.

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