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I mean, carbon fibre obviously. Those Tron-like TT/tri bikes with 80mm wheels and no triangle in the frame aren't possible with other materials (unless you want a 30kg bike).
Even talking about just "functional" bikes there are frame shapes that are possible now that obviously would have been absurd with old metalworking practices
frankenbike
Disc brakes is maybe the only "new" thing, but those came down from motorbikes I believe?
Which got "invented"" when people put engines on pushbikes for teh lulz.