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@gbj_tester
Ubiquitous for racing, whether it's steel, aluminium or carbon. You probably do see a lot of oversized steel, you've just got used to the big tubes and don't recognise them as oversized. Classic tubes set is 1" top tube and 1⅛" seat tube and down tube, 1" steerer in a 1¼" head tube. Anything with a 1⅛" steerer is likely to be ⅛" oversize on all the other tubes, except the seat tube.